How Does An Engine Brake Work And How To Troubleshoot Them. Jake Brake Troubleshooting.

[@dylanragland7702]

I'm a mechanic and I love ur channel. Its nice to see someone who knows what they are talkin about. I'm a huge fan. thanks for takin time to make videos

[@AdeptApe]

+Dylan Ragland Thank you very much sir.

[@Chiefs1582]

I like your channel I’m a lube tech that works at a truck stop I went to school for auto tech it’s very informative and fills in the gap so I can learn more about diesels so I can be a better technician everyday

[@iamthemoss]

I love seeing people who are passionate and nerdy about their profession. So many tradespeople don't take pride in their occupation but they should. Mike Rowe has done a tremendous service to the trades. Great channel!

[@terracethornhill]

The short answer: a jake brake pops the exhaust valve open at the top of the compression stroke to release the compression that would otherwise push the piston back down like a spring.

[@davidfrank6666]

hey, mr thornhill, yor answer is still a little too short! after u release the compression, the exhaust valve closes, as the piston goes downward, all the valves are now closed, so now u have created a cylinder where no air can get in, this causes high vacuum, this causes the engine to be very hard to rotate. the vacuum is the only reason for this slow down! u know, just like a car engine when the throttle is closed, and the engine is spinning at a high rpm.

[@andy16666]

Nope. The compression itself also slows the engine down.

[@MICKEY-nc4ye]

Thnx! On my cummins when I hit the switch for my jake brake, its litte to almost now power & pressure on it on high although I can tell its on!

[@Brady-w7v]

Nice

[@chrisharris5800]

This answers all my questions. I was getting the check engine light when the jakes were engaged on my C15. I'm subscribing now! Thanks a million!!

[@GR-pl1mk]

Hey did you ever figure out what your issue was?

[@garyharlow1588]

One of the best channels I've got, right next to dieseltech Ron. Keep these great videos with the knowledge that you provide with them!! Again thank you sir!!

[@stu110213]

I heard a good way to describe a compression brake when I was in school a few years ago. “The compression brake turns your power producing Diesel engine to a power absorbing air compressor.”

[@wadehicks9270]

Not into Diesel engine repair but always wondered how a Jake brake works. Lots of good info thanks for sharing.

[@AdeptApe]

+wade hicks Thank you.

[@mikea1973]

​@@AdeptApecan u explain why most diesels don't use an electric lift fuel pump up to the transfer pump?..

[@thetrain5785]

Just want to say im an auto tech have been for 20 years.work on sum light weight diesles. Nothing as big as you but really enjoy watching your videos very informative! Can tell you have a passion for your feild of work. Anyway thanks keep up the good work

[@AdeptApe]

+The Train Thanks for watching the videos and leaving the kind words. I'll keep making them as long as people watch them.

[@tarencemusako9526]

I'm working on a Detroit engine for the first time and to my findings this is exactly how it works. Also on trouble shooting I opened the top cover en test the solenoid with a test light acting like a resister while engine on idle and the Jake sounds was responding I suspect the fault is in the ecm

[@charlescoleman8455]

Wow! Thanks Josh! I have "check engine light" when jakes are active and stage one cuts out after a few seconds. Now i know where to look and hopefully my "fix it list" for you will be a bit smaller...lol

[@GR-pl1mk]

Hey did you ever figure your electrical issue out on the jake's

[@dhillonsavee]

Thanks as always, fixed my Jacks , got wiring diagram from Kenworth and after suspecting switch found high wire is broken couldn't find where too cold outside re routed New wire from ECM to switch and all good. I always had complaint high med low are not holding that strongly even low med vibrates, CAT techs adjusted twice and said all good or use service kit. after putting new wire now found what real cat brake. can do when 100% .it was closed wire from year's decreasing current client from12.6 to broken wire.Current flows ECM to switch and then back.

[@cwj9202]

Just to add to Josh's excellent video, I would like to mention one additional malfunctioning scenario along with its repair. Occasionally, a computer controlled 340 Jake and other Jake models will remain on after the engine has decelerated to idle speed or remains on when accelerating. The problem lies with a broken control valve spring (there are two) per Jake. Just remove the valve cover(s) and the control valve cover(s) to replace the spring(s). Good luck locating just a new spring, though, as I have had to purchase the entire Jake Brake rebuild kit just to secure a new spring - so all the Jakes receive new parts minus the solenoids. If one desires to only replace the defective spring, the #1 and #2 dash Jake switches can be employed to narrow your troubleshooting efforts to locate the offending Jake.

[@AdeptApe]

+Chad Jessup Excellent point Chad!

[@mechanik12]

Chad Jessup j'ai

[@GTIwarrior]

A little tip to help. many Jake solenoids have a plunger in the center. If you push that down with a screwdriver, you can manually activate the Jakes this is a quick way to determine if you were issue is mechanical oil or electric.

[@ShaneDavis-jk6dn]

Hi @GTIwarrior, when you do this, should oil spray everywhere as they activate?

[@GTIwarrior]

@@ShaneDavis-jk6dn you might have some oil coming out of the underside but it shouldn’t make a mess. All the oil should say inside the engine

[@shanemichael894]

Great video! I appreciate your time on putting this together

[@GripFreak]

Great stuff Josh! What about the other 2 solenoids on the jake brake assembly. One on each side of the center solenoid. The ones I tested all read 1.1 ohms. The center solenoid measured 10.2 ohms as you mentioned. Thanks bud!😊

[@nikolairomanov3160]

There is a sensor/switch on a clutch pedal, if a bushing gets worn on pedal arm it will play and won't send a signal to the ECM. That switch also for cruise control. If my Jake or cruise don't work I pull the pedal up. It's 387 2007.

[@BOBHANNA01]

Great video, your explanation is much easier to understand, than any other video I've seen. Thanks

[@douglasengle2704]

Thank you going over the topic of Jake brakes. Maybe you've governed it before. HD Diesel over-the-road engines use high boost pressure in the range of 42 psi. to make much of their horsepower How does the Jake brake system produce such high braking hp nearly as high as when hot exhaust gases are generating high boost pressure for maximum engine power? With no combustion going on there is much less exhaust pressure to spin the turbo.

[@scottcasner9344]

Damn bro! Just watched ur video on jake troubleshooting. Sure as shit u confirmed what i had been thinking. My jakes on the medium / high stage would only hit on the low side. So what i mean by that is position #1 works like a charm, positions 2-3, not at all. I gotta tell ya brother u my friend are a wealth of knowledge. I know as a newer O-op i sure as shit appreciate it. Thank you much. Keep up the good work hoss!

[@ReputableRides-bb7wy]

What fixed it?

[@scottcasner9344]

@@ReputableRides-bb7wy broken wire on the solenoid and a new switch on the dash. Worked like a charm hoss

[@joellagpacan9340]

Great info on this topic. Next video topic may I suggest is CAT Brake Saver, Can it be installed on any C15 engine? How does it work? Thanks again for all you do for this industry. JSL

[@AdeptApe]

+Joel Lagpacan I can do a video on one, but I don't have any video footage about them so it would be mostly pictures and me talking. They are very similar to a torque converter and it would be quite a task to add one to an engine, ecm reflash, different rear structure, oil system, etc. They leak a lot too.

[@joellagpacan9340]

I had the opportunity to drive a truck with a brake saver and I did not even use the engine brake going down a hill with 6% grade pulling 2 trailers at 129k GVW. If it does what its name says I think its worth it to add on to an existing engine. I only saw (1) truck in the shop for brake saver issue while I was working for a CAT truck shop for the 1 year I was there.

[@cmancman5329]

Thanks for all knowledge, I have a 1999 peterbilt 377 with a cruise control that works only for idle meaning it won't work on the road.

[@dreamchaser8508]

Any idea where I can this kind of knowledge for a Cummins you're extremely knowable but I own a n14

[@askelmedia368]

I run n14 select plus

[@gusrodriguez9114]

First off your channel and videos are awesome. My issue is on a 5EK41063 the jakes do not work on any setting when engine gets to operating temperature. Not even when manually pushing the center button solenoid. Issue stated after engine was overhauled and has since had overhead ran a few different times with no luck. Solenoids, wire harness, switches all have been replaced.

[@adve58]

hi friend!!!thanks for all the great videos and i have good news, i got the bus engine running!!!! the huey pump was no good but also the pcm had a burnt circuit, with your help and all the research i got the thing running am a auto mechanic and now i have a great respect for diesel mechanic any way my friend keep up the great work and have a very merry chrismas. sinc marcial adorno from puerto rico

[@AdeptApe]

+adve58 It was a 3126 right? I'm glad you got it running, I know you worked on that thing for awhile. A HEUI pump and the ECM, that stinks when there are multiple problems. You get an honorary notch in the Diesel belt for a job well done.

[@adve58]

yes it was the 3126 and it wasn't easy but it's running it just so happen that those two parts are like the most expensive ones! thanks again.

[@hpdv9428]

What will cause a week Jake brake on 06Cat C15? I can feel the difference between stages but still jakes are week and cant hold even a 25k load down hill. I recently did a overhead and nothing changed.

[@chadhauskin1461]

I have a 1994 357 Peterbilt with the 3176 caterpillar. the jake brake will work great for 1 hour in the morning and then would not even try to work for the rest of the day until the engine has cooled to Luke temp. Then you may have another hour of Jake operating

[@chadhauskin1461]

The check engine light is not on

[@cwj9202]

In an English class, the subject would be "Engine Brakes" followed by subsection (a) Compression Brakes, and that followed by subsection (b) Exhaust Brakes. Clessie Cummins Sr. invented the "Jake Brake", an invention which was first declined by Cummins Engine Co., but then picked up by the Jacobs Manufacturing Co. Adept Ape - I am really enjoying your videos, as you are quite knowledgeable. There may be an instructor position awaiting you in your old age at your regional CAT HQ.

[@AdeptApe]

+Chad Jessup I thought you were going to critique my weird accent/pronunciation at first when you said English class. Thanks for the little history lesson, I didn't know that Cummins turned it down at first even though it was invented by Cummins. I would like to be a trainer.

[@cwj9202]

The English class comment was directed to one of the posters who didn't take a shine to your use of the words "engine brake". One of the nice things about dealerships/franchises in our line of work is that they do believe in quality training. Yeah, so keep the future trainer idea alive.

[@AdeptApe]

+Chad Jessup I wish they trained us more. I haven't been to a training class in 2 years. I taught a class a couple months ago, but haven't been to one in awhile. I would like our dealership to work on Cummins and get trained on them. If I did videos on them as well I could take over the world!

[@RC-Heli835]

Our 96 Pete dump has a front Jake that will blow a fuse immediately if it is applied. So I keep it unplugged until we get around to pulling the valve cover.

[@drdoutdoors1603]

I'm having an issue with an mbn that on settings 1 and 2 works fine but on 3 it's like it stays on setting 2 and doesn't get stronger like it should. Now I had a guy check them and he literally did nothing but take the valve covers off and checked the overhead and solenoids to see if they were working.. he said everything looked fine and normal.. put the covers back on, I go down the road and crazy enough they worked fantastic, for about a week and went back to the way it was .. I had decided to just deal with it.. but then I had diesel in my coolant or we thought, so they checked to see if I had injector cups leaking and to do that you gotta remove the Jake housings. Turned out to be oil and not diesel and it was the oil cooler... long story short they put it all back together and I drove it and wouldn't you know the Jake's worked fantastic again on all 3 settings, until a week later I lost 3rd again... with all that being said I'm thinking it must be a bad wire in the harness somewhere where they had inadvertently got it working for a while by maybe moving the harness and then it eventually wiggles itself loose and it loses signal again.. would that be logical or would it be something else? Any thoughts? Or what I could check

[@Justinlendrum1]

Hey josh love your channel I’m a truck and coach mechanic and work on a number of different model engines I got asked a question the other day if a too high of oil pressure could cause the jakes not to work and I was stumped I wonder if you would have any input to that thanks a million

[@abelgallegos2056]

Thank you so much for sharing your knowledge, and explaining easy so we can try it on our own. I do have a lot of oil coming around the solenoid, how hard is to do the tune up kit? Do you have a video that shows how to do it? Is it easy enough for a low level mechanic? Thanks in advance, hope the best and success for you.

[@mchammer9084]

Thank you much appreciated . from Australia

[@skinny7878]

98 Kenworth W900L, 60 Series Detroit & only have Jake on 2 not 1 or 3. I'm going to pull the rocker cover & hope it's a wire, it's the old school push on wires so here's to hoping! Wasn't going to attempt this but this video changed my mind lol

[@AdeptApe]

+John Young I can't say whether all the things apply from this video to the Detroit's, I'm not familiar with them. Pulling the valve covers is a good idea though and you can at least ohm out the solenoids while you are there.

[@cwj9202]

I would suggest you check for voltage/current at the three-position switch also to ensure the dash switch and its connections are OK for the 1/3 selections.

[@skinny7878]

Chad Jessup thanks brother, will do! I'll be workin on the beast this weekend coming.

[@cwj9202]

10-4. As Josh discussed in the video, since #3 and #4 jakes are controlled through the 1/3 switch positions, that would be the point of investigation, and as both those solenoids are unlikely to malfunction simultaneously, I would suspect an electrical issue. Good luck.

[@robertreese6498]

Eng. 1 fmi 5 spn 1072. Would this be cyl 3&4 center v.cover?

[@jasonyoung1643]

Thanks for the vid man was helpful . I thought that the Jake break restricted the amount the valve opened to create higher compression more resistance on the engine. I would of thought if it completely opened the valve it would have no compression so I thought it would allow the engine to spin easier . Any way can’t argue with a diesel mechanic about Jake breaks . Cheers

[@robwhite3241]

Macks dynatard works something like that. But I heard that system sucks

[@ThunderingDiesel]

jake brakes are awesome they sound so nice

[@AdeptApe]

+alex Perez With straight pipes they sound great, on the newer emissions motors they sound like nothing.

[@ThunderingDiesel]

true, im only 17 I wanted to be a diesel mechanic after I graduate high school bit then I changed my mind and I wanna be a trucker and save money to buy my own kenworth w900 with a nice cat engine

[@AdeptApe]

+alex Perez Best of luck to you, if you can wrench on your own stuff you can save a lot of money.

[@ThunderingDiesel]

thanks and yes, maybe I still wanna learn how to fix diesels to work on my own

[@BigDish101]

They sound like a whale farting, lol.

[@StickNclutch]

So i went on a test ride with my bafoon hairy supervisor and he went nuts when i turned the jake break on his piece of shit freightliner with a cummins engine. He claims that an old timer once told him use the service breaks and never rely on jake breaks in order for engine longevity, is he correct???. I disagree disagree since the jake is made for the very reason and its installed on a truck..its a "truck" its made to withstand all kinds of wear and tare.

[@AdeptApe]

+sticK&Clutch The Jakes don't hurt the engine, they are designed to help slow the truck down and reduce wear on the service brakes. If the Jakes are malfunctioning then they shouldn't be used, but when they are in normal use they do not hurt the engine.

[@oldbloke100]

I was always told that the JAKE brake was very hard on camshafts. I had a JAKE on an Gm 8v92t and the biggest problem was broken power wires on the solenoids.

[@chuckbear1961]

I see 10X more annoyance in loud motorcycles than engine brakes and how come they arn`t banned !!!!!

[@BigDish101]

Modern engine brakes are quiet...

[@chuckbear1961]

I`m not against Jake brakes since they are useful on saving mechanical brakes just the loud cycles

[@GGigabiteM]

Motorcycles are probably the least respected motorists on the road, so they get a free hall pass on things to make them more noticeable to people in cars. There are also only a tiny fraction of people who drive them, how many motorcycles do you see on the road daily compared to trucks? You really only see them in numbers if there's a bike rally in town. Trucks on the other hand are everywhere and frequent. I don't necessarily have a problem with jake brakes - so long as they have a muffler to quiet them down. But I live over a mile from the freeway and when a straight pipe truck activates their jake brake, it's so loud that you can hear it even from indoors. The ban probably came from these guys who have unmuffled exhausts and are loud anyway, but are ear piercingly loud with the engine brake active.

[@myredfast]

Trucks aren’t banned either. Jake brakes are only banned in certain areas. Also it’s the pipes on the bike that are loud and yes when they are over a certain decibel they ARE illegal. Enforcement is not a priority due to fact that only a very few people are such chronic complainers that would complain about bike pipes, also law enforcement knows loud pipes save lives

[@thewrench324]

I’ve got a 2001 c-15 in a Pete 378 and this thing either has a normal functioning engine brake alike every other truck I’ve driven or.. for out of no reason that I can pinpoint as of yet, it will only engage after a solid 20psi+ brake application when it’s having one of these no work normal fits.. Notably on one drive when fully loaded going downhill slow for a long time the engine brake system disengaged and never worked the remainder of that drive until the next time the truck was used.. I’ve installed a new oe on off switch and replaced the throttle pedal sensor .. any hints or clues?

[@mrmatth3773]

Thank you so much. Very well presented.

[@ignaciohb4372]

Hello!! I have a peterbilt 335 with the paccar x6 engine with engine brake, my question is my transmission sometimes fails and the scanner showed low voltage but we couldn't find the problem, whenever the transmission fails the jake brake doesn't work either. Have you had any experience like that?

[@AmanuelChala]

Wow, great teaching. I am not a mechanic but I understand What you have educated. And my jake brake is not working the oil shooting upward through the solenoid to the engine cover so much and I am having a problem. Some times I am going short in fuel in fuel filter. Is there a possibility to fix this jake brake or do I have to buy a new one? Thanks.

[@jorgerd3606]

Thank you very much for such valuable information. God bless you.

[@rodhardman5237]

I'm just a driver looking to buy my own, i come across your and was impressed on how you explained the workings of the motor , is it possible to do a ideo on what to look for in a used truck (CAT) as i am looking for a 550 cat hope this makes sense

[@DosGringosRanch]

Question for you. Jake are working but when rpm starts coming down I start getting random popping from the front Jake break almost like a miss with that Jake. At high rpm it sounds right just happens when the rpm’s start to come down

[@tbren9341]

My truck lets out a cloud of smoke when i flip on the jake brakes (sometimes, not always) why is that?

[@BenDover-rb5pj]

Is it a mechanical engine or does it have an ECM?

[@evilkurtnevil2745]

I have a 94' 425 3406B and it only has 1 switch "0ff, 1,2" and checking with a text light has power to the jakes be when applied runs/shakes roughly. was intermittent but now constant. I've replaced the switch at the back of the pump and no change. could the jakes need rebuilt or where should i start to look?

[@chrid3]

my dad has a mack CX613 and the jake is strong the first time you use it for the day then it is weak for the rest of the day under operation. no check engine light. if you had to take a guess what is wrong with it what would it be?

[@hardymeza7855]

Bra,,, don’t want to see your mug,, grab some crayons and wrong pictures 🤣🤣

[@davidignacio3745]

Hi I just bought a Peterbilt with a 3406e cat I have never drove a semi with a Cat before what is the highest rpm should I run at ? Thank you

[@randallmercer4995]

Great video Josh. Just curious, but what would be the effect of a loose or tight lash setting? For instance, an early 6NZ with a lash setting of .033", plus or minus .003". If the lash were set at .028", or .037"? What mechanical effect would these settings have on the engine, and engine braking performance? And, would any engine damage result? Thanks in advance.

[@MegaGeorge1948]

I assume that the Jake brake equipped engine is non-interference type where the open exhaust valve will not strike the piston crown when the exhaust valve opens at piston TDC compression stroke for Jake brake operation.

[@foxyota86]

How often do jake housings need rebuild or tuned up. I had a number 3 exhaust rocker break and someone I know says the jakes need rebuilt.

[@gregthompson6585]

Great video. Have you ever seen a jake stop working after the oil gets good and hot? Older 3406B , the voltage is present and don’t see any oil leaks.

[@MRALBERT571]

Sounds like your do for a rebuild on your jakes, personal thought from past work.

[@shawndavis8912]

Hi, I am attempting to repair a c15 acert engine compression brake non-operational issue. All 3 brakes failed at the same time. All 3 brakes were tested via external 12 vdc power source, none would function with this method either. But, the solenoids can be heard clicking when power is applied. The check valve at the back end of the oil manifold has been verified operational. Wiring continuity has been confirmed between ecm and all brake solenoids as well. Both solenoid power signals have been proven via 1amp test light when brakes are supposed to operate. I am at odds on where to go from here. Is it possible that this engine simply needs overhead adjustments? Strange that all 3 failed at same time. Any suggestions would be greatly appreciated. (The IVA system is setting check engine light also. The wiring continuity has been verified between the IVA oil pressure sensor, as well as, the IVA oil warmup solenoid. Both components have been replaced with new, but no improvements were observed. How can the IVA circuit and system affect the compression brake functionality?)

[@MrZanerulzz]

Maybe you’ll see this maybe you won’t. But my issue is intermediate. I get full jakes when the oil is colder and the pressure is higher but when the oil is up to temp there’s an audible loss of power and you can physically feel it. I thought it was the solenoids going bad but now im not sure. I’m planning on replacing them all here in 5 days so hopefully that fixes my problem. Before I go that route do you think my problem lies elsewhere?

[@bigsleeperstudios8865]

Trying to see if I can get some help with a jake issue. 2006 Peterbilt 379 with 475 acert cat. Engine was rebuilt about 2 months ago by cat. Engine brakes don’t work properly. Seems as if they are on low to medium even though the the switch is on high. I can move the switch from medium to high and it seems as if there’s hardly any difference at all. The mechanic at my shop checked the overhead and said it was out very little. These things are driving me crazy because they aren’t working properly. Also, in the mornings below freezing the truck skips and sputters when I start driving it for about 2 miles with lots of smoke out of the exhaust and raw fuel smell. Fuel filters have been replaced, but they are not cat filters. Also it doesn’t have the power that it should have. No engine codes at all. The mechanic at my shop doesn’t want to take it back to Cat because without an engine code he says they won’t touch it. I’m pretty mechanically inclined and been driving these for years. I know this engine isn’t operating properly. I want to try to fix it myself if i can. Can you help me with any advice at all? Thanks!

[@ahmedyamen6696]

My brother, I have a problem with a Cummins L10 engine that operates with an engine braking system, but the problem is that when we start the engine, it does not start. After the inspection, we found that the electricity to the injectors was cut off. Does it have anything to do with the brakes that you are talking about? Please reply.

[@KennethMixson]

Just a little tidbit. The name Jake Brake comes from Jacobs Engine Brake which I believe was the first to introduce it. Now there are numerous types, brands, configurations and brands out there now.

[@AdeptApe]

+Kenneth Mixson Very true sir, Jacobs used to make the compression brakes for Cat. Then they started making their own and using Jacobs, by the later model years Cat only used their own brand.

[@waynehowkins]

Thought you might have included why a Jake won't work after changing injector o rings. Mine only sputter a little bit. Seems like air trapped in my Jake housing.

[@Keliiokalani234]

I had a question so I have a 3406e with the old style Jake’s we’re good from ecm to solenoid and switch to ecm is getting voltage but James won’t turn on. Apparently truck obtained a new ecm and previously the Jake’s worked I’m in desperate need of help this truck has me stumped also it has no check engine lights 🙏🙏

[@Pynetree81]

I have Jake’s that are only working on low. No medium or high level. I do have Cat ET and my ecm is showing correct position when commanded by the switch. My question is can you simply take a DVOM and test for voltage at the wires going into the solenoids? It’d on a 5EK 3406E with I believe they are 310 model Jake’s.

[@brandonaynesmay352]

I'm coming to a stop sign and my truck starts engine braking on it's own is that normal? Engine was warm about 200. It is an auto so not sure. Sounds like lvl1 engine brake. But I don't have it on. It's not braking hard but it's just downshifting with the engine brake on as I slow down or come to a stop.

[@pedropabolacosta8613]

very good video bro ... I have a question ... 2001 caterpilla C15 475 jake brake cylinder # 1 end # 2 it broke down and I replace it end broke again!

[@IndigenousAmericanTrucker]

Great info although I'm having a N14 Celect jake issue! Can a bad idle control switch make the jake power go in and out??? Meaning level 3 is giving me level 2 power one minute and then kicking in to level 3 power after a while or sometimes never and will just stay at level 2 power while on level 3 and sometimes will give me level 1 power! Only code that read was cruise control but my cruise control works, the Idle control switch which is below the 2 cruise switches is the only one that doesn't work!

[@DaveCVO17]

I have a question, my Jake will work only on stage 1 and rarely and I stress rarely will work all 3. where do you think I should start?

[@Brian_Smith67]

Is there some kind of sensor on a 2007 C13 that would control the Jake's from not working? And there's no light on the dash!

[@timothy4037]

I have a C-15 6nz. I can turn jakes on low and it works turn on medium different sound and more making power. When I turn on high it’s the same as medium. Any suggestions?

[@stevosprojects7123]

Adept ape thanks for the videos ,they are super helpful ,just had a question so I have a c15 single turbo engine and the exhaust brake quit working while driving and engine light came on ,when I checked the engine the engine oil was at the add mark on dipstick just wondering if low oil would cause the Jake's not to work??

[@k2alex2000]

Would you please explain the DETROIT 12.7 JAKE BRAKE function process. Thank you

[@marlonlawe2749]

Awesome video!! Thank you so much. Very informative!

[@christianwagner1139]

I have a problem with my engine brake that i cant figure out. When its at higher rpms it works fantastic. When it gets down to 13 or less on the tac its breaks up, works and doesnt work in intervals. Is there a problem with the rpm sensor in the ecm? Or does it need to be hooked up to a conputer and adjusted? Im at a loss. Ive monitered oil pressure and such thinking the sensor was messing with it but no luck as it seems to be fine.

[@WCGwkf]

is this different because it's a diesel? in any regular car you're pretty much always engine braking if your foot is off the gas in gear and obviously it's more effective in lower gears.

[@davidlovy1271]

Diesel engines have very little drag when your foot is off of the accelerator. A gas engine has a fixed fuel to air ratio, and the power is controlled by changing both the air and fuel at the same time to maintain the ratio. The air is controlled by the throttle plate and produces a lot of drag when it is closed due to the high vacuum created during the intake stroke. In the original diesel design, there is no throttle plate to reduce the intake air. Diesel power is controlled by how much fuel you inject in, the air component is always the same and will only change when the engine and/or turbo speed changes. The fuel to air ratio in a diesel varies widely. A gas engine with your foot full on the accelerator and the key off has the same drag as a diesel with your foot off the the accelerator. If you have ever driven a gas car when the timing belt snaps, it also has very similar feeling to not having any engine braking. Without valve timing, there is no productive vacuum pumping happening.

[@WCGwkf]

David Lovy thanks

[@GIGABACHI]

Awesome as usual 👍

[@AdeptApe]

+JIGA BACHI Thank you.

[@dennish9522]

Damn you have the gift to teach...

[@str8outofms474]

I just recently purchased a 05 w900l when I got the truck the jake brakes work perfectly about 3 to 4 days ago they're stopped working they still come on but does not slow the engine down like it used to when I first purchased it what will cause that

[@skeetersaurus6249]

Good point made at 2:00 (Jakes are compression brakes, not exhaust brakes), but you keep using the term 'engine brakes' too, and a Jake brake is NOT an engine brake, as only gasoline engines can be 'engine-braked' (throttle release causing an air reduction at the manifold, which then causes a high manifold vacuum - this is not what happens in a diesel engine). Jake-brakes (Jacobs Vehicle Systems, by brand-name) are true compression brakes (I'm not sure if they still even make an 'exhaust-brake'). I like how Jacobs (the company, itself) loudly down-talks 'excessive volume trucks', and states clearly that there is 'no reason a properly functioning truck with a Jacobs system on it should exceed 85-decibels noise at 50-feet. They for years asked people to call police and report 'loud trucks', because the noise issue caused drivers not to be able to legally use them, often in places where safety and traffic would actually benefit from their use.

[@AdeptApe]

+Skeeter Saurus I've never heard that about Jacobs and excessive volume trucks, that's an interesting story. The lack of a muffler is really the reason for the loud Jake's and not the brakes themselves, as I'm sure you know. I used the term engine brake throughout the video because that is what people call them and when a sign says no engine braking, it means compression brakes, even though Diesels produce very little vacuum in a no throttle input condition. Thanks for commenting.

[@tmccauley3211]

So on my 3406E, stage 1 and 2 work, but stage 3 cuts out when my engine speed goes over 1500 rpm. It is getting bad. What is the culprit?

[@hydra98001]

Very informative. Thanks for sharing your wisdom with all.

[@fuzzybutkus3951]

I also ran a simple push switch they have them to lay on its side on the floor board that way i could use the side of my boot to push in and Jake comes on release Jake goes off. It was wired through the Jake switch on the dash. I just hated using that button if I need to turn. Everyone that saw it had theirs done that way.had to clean a couple times in the winter with electric cleaner.......No offense you need a glass of water.

[@AnthonySmith-im5wm]

my Jake works on low, but on medium or high the check engine light comes on, and the Jake make s little noise then nothing. about how much would that job cost, answer greatly appreciated. c12.

[@DukeCityDom]

Is it normal for the Jake housing to squirt oil oil when pushing on the Jake solenoid to activate?

[@moctezumaRevenge]

I just bought a 97 pete 379 and I'm still working on it i heard it back fire threw exhaust, any idea has cat 3406 not sure B or E. Can it run like that so I can save some more cash to fix or should I fix it asap runs good but it does have a check engine light on and I still waiting on a mechanic to come check it out.

[@mrgmrg9943]

What if only low speed engine brake works, and truck has noticeably lack of power. I just finished installing new wiring harness, as my timing sensor wire was exposed and cut in half while driving

[@alexsafi8090]

my man I hope you can read this and answer my question please I have a cat c15 twin turbo ,,,,That when I used the engine brakes for the first time ( I never used it before)... I have very bad and toomuch air in coolant pushing coolant out that happened right after a new cylinder head installed please any suggestions Thank You

[@kensailovero6966]

Hey, I need a little help. I have a rollback with a cat c7 motor & Allison transmission combination. it quit while I was driving on Friday, turns over has fuel and won't start. all my lights come on my dash when I turn the key besides my check engine light. I assumed the ecm isn't getting power but I don't know, I got a check engine light before it cut off while running at 68 mile per hour hit a bump then motor turned off.

[@michaelk8554]

Having a problem with my Jacob engine which only has (Off - lo -Hi) for the most part it works fine, except when I'm slowing down on a highway off ramp. When the engine rpms slow to about 13-14 rpms the engine start shacking rocking the whole truck. I just had my engine oil changed and it still does this...….What could it be?

[@sankar7055]

While the jack brakes on with low ,medium And high, will the ECM cut the power source to Injector solinoids

[@tomschilinski10]

Well I’m not sure if you still monitor this or not. But you answered some of my questions… like why my Jake sounds the same on 2-3… and it doesn’t work on 1.. what are the chances of it just being a bad solenoid on stage 1. ? Hoping that’s all it is anyway…

[@AdeptApe]

Usually Jake problems are input problems to the ECM more than hard component and solenoid problems in general.

[@tomschilinski10]

@@AdeptApe is there any way to test the solenoid without a computer ?

[@AdeptApe]

Not easily, you can ohm out the circuit though. Send me an email and we can discuss it.

[@joeforari1269]

What should I start with if I have medium but not low or high

[@bocho69247]

Well I need your help am having problems with my jakes there not slowing me down at just had the tune up kit put in set the valves again and still not doing much motor is a 6nz C15 thank you plz help

[@bernardparker3390]

My Jake brake is working but the issue I’m having is the best way I can describe is a backfire, they pop loudly once I began to accelerate. Thanks for the invite her and possibly please advise.

[@Sandhu_6]

What was the issue with your jakes. I had same issue to.

[@bernardparker3390]

@@Sandhu_6 i still havent resolved the jake issue yet.

[@silvesterweber2879]

It's all connected including the NUT holding the Steering wheel

[@williammoody7412]

Hi, Do you know Where will I find the fuse for Jake brake 96 357 Peterbilt 3406c

[@Teemane71]

How can you tell what order the Jake brake's go in or are they number?

[@ffejkk37]

Dude your video is awesome I love the information and visual examples. Gotta work on the lip smacking tho

[@AdeptApe]

+Jeff K You know I never noticed them and then someone said something about it a couple weeks ago and I relistened to the videos and now I noticed it. I seem to mostly do it on the voice overs so I'll have to work on it. Thanks for commenting.

[@ericmccartney7519]

all my stages work but im not getting the full comprssion out of my jakes. just had overhead ran they worked fine for 700 miles now its back to not working properly. any suggestions

[@bocho69247]

Eric Mccartney did u ever find out what’s wrong with ur jakes mine ain’t holding jack so am trying to figure it out

[@robertfrancis4202]

@@bocho69247 Have you repaired your jakes since posting the comment? What was the issue?

[@bocho69247]

@@robertfrancis4202 well i had a big hole in my air to air got a new one made them a little more strong redid overhead and helped a lil more

[@truckinstuff2849]

Good Job...Keep Teaching...

[@itsFsmitty]

Hey josh i love your channel, thanks for posting these videos. Do you have the name to the multimeter tool you used to diagnose the issue? Your amazon link to it is no longer is active.

[@oscarjuanr]

Hey sorry to bother, i got a Cat 15 single turbo, i notice the jake brake #2 is leaking more oil than the other 2? Any ideaz!!!!'