The Difference Between Jake Brakes And Exhaust Brakes?

Jake Brakes, Engine Retarder, or Compression Brake versus an Exhaust Brake, what is the difference between them? This video goes over the differences in design, effectiveness, and maintenance.
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[@lawrencemagda3357]

Jake Brake keeping America awake for over 40 yrs! :)

[@Tanner-bg2qn]

Lawrence Magda a lot aren’t loud at all. But yeah if it has pipes it’s load af but music to my ears.

[@Dd-qz4ym]

Yep

[@raymondgarafano8604]

U R GOOD!

[@Mapp2004]

Jake Brake = Motivation

[@michaelmonaghan2717]

Nope! Only loud when bubba gump removes the muffler, and runs straight pipes!

[@greggcollins4215]

This is the best description of how Jake works I have heard. Every other explanation I have heard has missed telling about the timing on the exhaust valve opening. Everyone else just says that it holds the valves open but they don't say just when they are opened in the cycle. Now I get it.

[@anonymous4507]

Here's the best explanation of how they actually work. Imagine you are on a pogo stick. You hop up in the air and as soon as you hit the ground and compress the internal spring, or air in the case of an engine, I reach down really quick and take that spring away, or dump the air in the case of an engine. You hopped up in the air to start with, then hit the ground, I took the spring away, now you just make a thud and that's it. You don't spring back up in the air again because I dumped that stored energy at the exact right moment. Another simple explanation of a Jake brake is it just turns your big diesel engine into an air compressor. When the Jake brakes are activated, the governor or the ecm cuts the fuel and manipulates the exhaust valves on all the compression strokes exactly like how a big air compressor would work. Unless it's a rotary screw air compressor which are much more efficient.

[@matthinge789]

Funny story about Jake Brakes - The original idea came from Clessie Cummins, founder of Cummins after he had left the business in the 1950s. They had an agreement that he would present them any inventions he came up with, but they were not interested in this idea. Clessie presented the idea to Jacobs Manufacturing Co. and look at them now!

[@robertborchert932]

I've worked with Jakes both on Cummins and Detroits. Both work very well. In the Fire Service, we had retarders on some apparatus. This is electric, a device fitted to the driveshaft. They use aluminium disks and electromagnets, absolutely silent and magic.

[@neptarclepuffin]

Makes a fuck ton of heat when in operation... Energy has to go somewhere

[@user-si5fm8ql3c]

@@neptarclepuffin many retarders are hooked into the engines coolant, so overheating isnt a big concern

[@mattywho8485]

And expensive, don't forget expensive !

[@olspanner]

Well done, simple easy to follow description of Jake vs Exhaust brakes.

[@maccliff2115]

I wish my instructor at UTI (Avondale/Phoenix) in 2005 was as knowledgeable and articulate as you. Great video.

[@mzee5533]

Hello there Adept hope you're doing great mann. Keep these videos rolling mate 👍👍👍

[@johnfry9010]

I watch all of your videos , I drove big rig's for 34 yr's and I can tell you the jake was the single best invention in trucking ever ! I drove trucks without them and it was HELL . I put a exhaust brake on my 2006 Dodge Cummins and I can tell you I am impressed , I wish I would have done it when it was brand new . I went with the PacBrake because it was rated the best , and it is amazing . Thanks for all the good videos .

[@vf12497439]

You got to see a lot of changes. But the kids today aren't taught how to deal with coming off a grade without an engine brake. I drive log truck, theres times on mud or ice with steep ground where the Jake is no good if you want to keep your drivers rolling. They just dont teach new drivers real skills anymore. If the trucks mechanical or computer systems cant do it then its unsafe and time to park the truck. It's a sad state of affairs where we have a serious job and few are qualified to do it. Automatic slack adjusters is another advancement that has newer drivers with less skill. Most of them have no clue how to adjust them and never look at their brakes. I'm under my log truck mon, wed, and friday adjusting my brakes.... my life depends on it! I had my company take the auto adjusters off my tractor and put manuals on. I dont want to become complicit in assuming my brakes work as advertised. With manual adjusters I see and touch the equipment and yes... I found a cracked brake drum last week. Modern equipment is making unsafe drivers. No wonder accident rates are going up even tho rules and regulations are stricter.

[@carrolannethompson3947]

@@vf12497439 1st two yrs driving bobtail tridrive bodyjobs transport straight into BC winters, I didn't use my jakes OR cruise, just lockers when needed. I thought I would fly off the surface if I did. So right onto the deep end. Dad would be proud, meebee .. lol!

[@jaygraham4095]

@@vf12497439 have to agree with you. The computerized & automatic systems on all vehicles are duming people down. Don't get me wrong some of that stuff is great but we shouldn't be relying on it 100%.

[@jeremypayton8315]

Also brakes on the steers.

[@jasongeorge7987]

I've been a school bus driver for 10 years, and I've driven quite a few buses. One of the buses I drove had an exhaust brake on it (think it was an '05 International, can't remember what kind of engine was in it though). It was a really nice feature, especially on field trips. Coupled with the automatic, it would not only slow down on the hills, but the tranny would also shift down on its own. I still had to use the brake pedal, especially with a lot of passengers, but given that Internationals tend to require a heavy foot to operate the brakes, it was a really nice ankle-saver. The biggest drawback I found with it was the odd smell of burnt diesel whenever I used it. The odor would get into the cabin and stay there for a minute or two after I'd turned the E-brake off. It wasn't overwhelming, but still noticeable. I really miss that bus sometimes. Out of all the Trash Nationals I've driven, it was actually a good bus!

[@thetruthspeaker1978]

Lmao 😂 It says it's been two years since you wrote this with no reply and only 4 thumbs up. Hilarious, topnotch writing. I guess it just requires to much joy for all the Karen's to catch the joke.

[@jasongeorge7987]

@@thetruthspeaker1978 Maybe they would have gotten it if I'd called it the Thirteen Letter S*** Spreader?

[@thetruthspeaker1978]

@@jasongeorge7987 They might catch your drift then.😂

[@deanh7190]

@@thetruthspeaker1978 4 months after you wrote, the count is now 9, still very few are 🤣🤣🤣. Great story.

[@robertcirincione6099]

Just watched the video and wanted to comment. I worked for Mack in the late nineties and they had this setup with Jacobs called the Stealth system on their 454 E7's. It was the Extarder exhaust brake with the Jacobs engine brake together. Basically on the low setting it was just the exhaust brake and then on the high it was both but the compression brake was detuned so it was basically a failure. Went back to just a Jacobs engine brake on the ETechs.

[@miketeeveedub5779]

I always assumed they were the same - now I know the difference. Thanks for the explanation!

[@bertgrau9246]

Today most diesel engines come with some kind of engine brakes, I remember when you had drag your feet to stop your truck , glad those days are gone

[@mohnish7653]

What do you mean drag your leg ? Won't it tear your leg from your torso

[@CallumTapper]

@@mohnish7653 people were much stronger back in the good ol' days

[@mohnish7653]

@@CallumTapper i highly doubt this claim you cannot stop a truck with your feet

[@Ty81494]

I use gravity rare I have to actually apply brakes to stop

[@colonelmann]

This was really interesting. I've used engine brakes but really had no clue of the mechanics of these units. Plus the none truck driver question people ask "why do those big trucks make THAT loud noise?"

[@cristianomaddog]

Best explanation of Jake brake I found! Thanks!

[@Rekuzan]

Congrats duder, you just got a new subscriber! I'd never even heard of you until today & it did not take long to win me over. Keep it up!

[@cockasorrus7475]

Thanks for some more great information explained very thoroughly!

[@edwardojr2838]

Our dairy has the 2015 Cat truck with automatic 6 speed trans. From what I understand, International made Cat the engine, and Cat painted it their signature Cat yellow color, and put their own name on it. "N13" we discovered it came with engine brakes as well as an exhaust brake, once we pulled the motor to swap out with yet another "Cat" motor made from International

[@Ckcdillpickle]

Cat really own makes their big engines a big equipment... Practically everything else isn't made by them

[@tracylemme1375]

Thanks for the explanation. I don’t seem to be able to explain to people how efficient a Jake brake is at being inefficient. Classiest was a genius. The patent was a wedding gift to Clessie’s daughter and new son in law. He was of the Family known for Jacobs drill chucks.

[@fokkerd3red618]

Had no idea about that. Some people probably aren't aware of what a Jacobs Chuck is. To give his daughter the patent on the Jake brake as a wedding gift, is making them multi millionaires on there wedding day. Wow what a gift.

[@anonymous4507]

Inefficient compared to what?

[@tracylemme1375]

@@anonymous4507 It is made to waste kinetic energy, from the forward momentum forward of the vehicle and turn it into compressed air which is released to atmosphere. Drum and disc brakes also waste energy but they turn it directly into heat and get hot. When they get hot they don’t work well. Jake brakes only heat the air that they compress which is released.

[@J.R.in_WV]

Josh, I’d love to see a video on operation and rebuilding or the inner workings of the CAT BRAKESAVER. I understand the theory of operation but would love to see one in more detail.

[@Gcal1956]

I'm so tired of explaining this to pick up truck owners. That's for the video.

[@jkollar109]

Haha No kidding. Was buying my truck and asked the dealer about the exhaust brake. He looked at me with a puzzled look. I explained what I was talking about and he perked up, "oh, you mean the Jake Brake!" No, no I don't but sure...

[@Eric2300jeep]

@@jkollar109 Haha I feel ya. I have an '03 Cummins with a factory installed Jacobs exhaust brake. So hard to explain to people that it's not actually a Jake 😆

[@davidwalle5025]

Good video josh, keep videos like this coming.

[@williamdonnelly2967]

Donaldson makes the "Silent Partner" series mufflers to quiet the exhaust to Quiet City Ordinance Standards. It is worth looking at if you want to run the Jake Brake in a city.

[@davidroberts2404]

Who wants a muffled truck. Run the Jake anyways I pay those signs about as much attention as the chicken coops

[@kirk326]

Very straightforward and understandable information. Helped a lot for me. Thanks for investing the time into the video!

[@ISXCUMMINS565]

Great video as always 👍

[@mechanicchaz7639]

This was a great video on how the two systems work

[@46fd04]

I own a 2019 Dodge RAM with a Cummins diesel engine. The Exhaust Brake works awesome when towing my 5th wheel trailer.

[@jordanbryant5260]

Wow very well explained! Thanks

[@kirstenspencer3630]

The exhaust style engine brake can be useful when shifting going up a steep hill. The equipment were school buses with spicer 5 speeds powered by cat 3208's.

[@mattywho8485]

I have one on my 5.9 Cummins and it does NOT react quickly enough to have anything to do with downshifting.

[@mattv16031]

Thanks for all the great info!

[@maxxproductions7749]

Very well spoken

[@brianhurt3801]

Good overview , simple understanding , enjoy your knowledge share...

[@danielc5205]

A lot of class 2-6 diesel trucks nowadays will usually have an exhaust brake.

[@akbychoice]

I’ve driven semis in every state but HI without a Jake brake, Retarder or Exhaust brake. I’ve driven with a Jake or Engine Brake in almost every state. I’d choose any advantage over none, though I’d choose a Jake equipped engine first. You rarely see Sqawl Handles anymore, so many trucks becoming automatics so anyone can hold a steering wheel. I’m glad I’m done with it.

[@BadEye3621]

With that logic you shouldn’t drive cars anymore

[@84gssteve]

Great info! The exhaust brake on my old International Maxxforce felt about as effective as the Jake on my old N14 and my new ISX15 truck with the system set to "1"..... In other words, it was damn near totally ineffective. Brake jobs nearly tripled in elapsed time after I ditched that Maxx POS......

[@jamesshaw4954]

The maxx force got a bad name but I drove one with 620,000 and it was a damm good motor held great oil pressure and pulled up mountains without having to downshift

[@84gssteve]

@@jamesshaw4954 I'm sure there will always be examples of any contested engine model that do alright, after all they did make thousands of them! That said, the general dissatisfaction with the MaxxForce combined with the subsequent abandonment of the engine for Cummins engines by International, tells me they had an overall bad engine on their hands. Mine had only 250K and almost never worked right or ran without a check engine light on. My N14 went 850K miles with almost zero problems and I've got an average of 300K on several ISX15 engines right now, with only regular maintenance required.

[@ramman4381]

My maxx 10 had an egr cooler failure twice, causing a hydro lock situation. Has had 2 in-frame overhauls, and still has less than 60,000! No “self-called” truck driver, will make me believe these are even decent engines. Pure, pure, junk!

[@justaskmeiknow5584]

Intertrashional...there motor was trash but boy did they ride nice

[@deankay4434]

Try playing cards in the spokes and stop whining! DK, ASE master tech since 78

[@repairvehicle]

Awesome info. What grease do you you as preventive maintenance on exhaust brake system?

[@sbacon67CTD]

Your videos are awesome, do you have a video for changing trim codes using the ET? Just getting into using Cat ET

[@nbitt1319]

Excellent clean explanation

[@colbyc.6698]

Love all you videos channel is growing awesome

[@jamesgarrison6430]

I love the sound of Jake's

[@jake-mv5oi]

Very informative. Thanks.

[@serpentrae]

i can't wait for your video on the cat brake saver

[@johngoldsmith6629]

Rebuild one of these. Not many of us left who knows how to.

[@dougboyd9599]

Just wanted to say thank you for all these great videos you take the time to put on here and also do you still work on cat edges cuz I'm thinking about buying a truck with a cab engine and I'll most definitely like you to work on it if I get one

[@roblunday4293]

So what is your opinion regarding exhaust manifold durability on exhaust brake systems? Are manifold and stud failures more common on exhaust brake systems? How does your shop handle manifold issues? Machine or replace?

[@muhammadhanifkurnaen6689]

Rob Lunday probably it depend on the design and material strength of the exhaust system. If they strong enough usualy it will fine. The exhaust system mostly corrode faster so see this factor too beside design and material. Here in indonesia, i see that using exhaust brake mostly impact lifespan of the turbocharger (turbine side) which put stress on oil seal, the shaft and bearings of the turbo. Comonly happened on light duty truck such as fuso canter or hino 300(also called dutro). Both of them still use engine technology from 90s. Its mechanical direct injection without any computer control. Medium duty truck like hino 500 are not so much affected as they have stronger design and very relies on exhaust brake.

[@SL-ix4yk]

So I run a Detroit DD13 and I've been told it's got a real jake in it but I've also been told it's got just a exhaust valve, it's only 2 position, it works ok, the older Cummings X15 I used to run had a real 3 position jake in it and that worked incredibly well, but the interesting thing is the Detroit is LOUDER really loud , the jake in the Cummings was quiet, both were completely stock exhaust, the DD13 is a grass burner.

[@badgerpa9]

Cummins no G

[@frankleonard6570]

very good explanation! thank you!

[@garthcarrier]

great detail. you explained very well. and your well spoken . you should be a teacher. or your probably are.

[@leorguevara3622]

Mack had a "stealth brake" which combined a Jake brake with an exhaust brake.......worked VERY effectively vs our trucks which had Jakes only

[@jacksak]

Excellent description!

[@Leon-lp9fl]

Thank you very much, find this very informative. Busy building an exhaust brake for my Thar. Roxor over there. Does the butterfly need A breather hole? Best (SA)

[@yellow04]

Awesome! My 18 ram with g56 had the exhaust brake and it works amazing. I’m ordering a new class 6 truck with the L9 Cummins. The exhaust brake was 184$ and the compression brake was 2132$ LOL I wouldn’t even be able to use it for what it’s worth so engine brake it is.

[@CrazyBear65]

The Jacobs Engineering engine brake. I thought it was just a compression release. I had a dirtbike that had a compression release. The tow trucks I used to drive had a form of a compression release, they had a CAT engine that looked suspiciously a lot like a smallblock Chevy with an injector pump and no carburator. I like the sound, "BWAUGGGGGG!" That's the sound they don't want you to make near schools and hospitals...

[@Knuckledragnation]

Mr. Adept Ape more illustrations and photos please. I’m new to owning a diesel not to mention I’m a bit slow when it comes to visuals on things I know nothing about. Thanks for the info and the explanation sir. ✌🏽

[@leighriley6277]

Hi mate, bloody excellent videos..I'm a retired diesel mechanic in Australia, spent most of my life working on Macks, Cummins, Cat and early Detroit's and was wondering your thoughts on truck drivers using their retarders (jakes or dynatard) to drop their revs when floating their gears. I can remember in the 80's Mack had some camshaft failures they attributed to drivers using their retarders when floating gears as the engine brake was being used very briefly on an unloaded engine and the camshaft was failing...any thoughts...love your channel, bloody excellent mate 👍👍

[@rolandtamaccio3285]

,,, many do it, ,,, just tooooo much wear on the valve train .

[@AZVIDS]

Wow, great explanations👍👍👍👍

[@TheCRTman]

This totally makes sense!!

[@virian2010]

You did a very good job explaining how a Jake brake works on a Diesel truck engines do you think a Jake brake could work on a Gasoline type car or truck engine the same way with the same effect???

[@tomcline5631]

Exhaust brakes will work on gassers. Also the old transmission brakes were used on gassers.

[@buelowexcavating]

Great video!

[@wushock92]

Nice explanation.

[@jimneustadt2688]

Excellent explanation!!!

[@xc8487]

There was a company about 10 years ago trying to fundraise for a product called ThunderBrake, a jake system for Cummins 6bt. It would've mounted the solenoids on top of the valve cover.

[@coffeyscarburetors6437]

That moment when you flip the jakes all the way up and the truck keeps speeding up.

[@codenamecordon]

Coffeys Carberators that just means it’s a good hill or you’re loaded heavy. Or both 😃

[@-Luna-tic.exe-]

Lol then you ease on the brakes and hope like hell there's not a sharp curve

[@drrocketman7794]

😬

[@michaelclosson68]

@@codenamecordon that means you're about to meet jesus.

[@codenamecordon]

Michael Closson been in that situation several times, still here 🤷‍♂️

[@cwj9202]

Excellent video as usual. Minor point - on the older mechanical engines, the fuel was still injected, so the only way to prevent that was to turn off the start switch, which some drivers did, and that did create more retarding power; however, the injector plungers were still going up and down but without the beneficial lubricating properties of diesel fuel - bad news. So, if I was informed of that practice, the driver was educated on the potential real adverse effects of that practice.

[@Equiluxe1]

All the jerk pums I have worked on shut the fuel off as soon as the engine was over run, and as the fuel was still flowing throgh the pump there was never any harm.

[@cbmech2563]

On the older mechanical engines turning on the Jake caused oil pressure to move a plunger down to lock the injector plunger so no fuel is injected . Then the injector pushrod causes the exhaust valve to open .

[@cwj9202]

@@Equiluxe1 Not on a Cummins PTG fuel system. There is certainly fuel still flowing through the fuel pump in that scenario, but no fuel could bypass the fuel pump solenoid to the injectors once the diaphragm slams shut due to lack of 12 volts.

[@cwj9202]

@@cbmech2563 - That is not correct. When the cam operated injector push tube rose to push the injector plunger down while the Jake Brake system was operating, it simultaneously activated the Jake Brake hydraulic system which (short story) opened the exhaust valves. At no time were the injector plungers locked down.

[@cbmech2563]

@@cwj9202 It's been a long time since I set up a set of Jakes but I do know that no fuel was injected when the exhaust was popped

[@michaelsiler4741]

Josh you are the man. I need your help with a c15

[@johnniezuniga6841]

Thank you for sharing your knowledge and on

[@MarionBlair]

Excellent

[@gavinbitz2563]

Very informative thank you. I have an RV with the 8.3 Cummins. It has an exhaust brake switch that I turn on and it helps, but reading through the manual it says it has a retarder, which from my understanding uses the transmission for braking. How do I know if the exhaust brake is working in conjunction with the retarder? It just doesn't seem like it's slowing like it should. Is there a way to bench test exhaust brakes or is it best to have someone drive the RV while I'm in back by the engine and just physically look at the exhaust brake to see if it's opening and closing? I learned a lot from your video thanks.

[@megastick9324]

Anything that slows you down is technically a retarder, retard means slow, or to slow. So by definition it does have a retarder.

[@Make-Asylums-Great-Again]

I could ride with you, I'm retarded.

[@b4roni1]

got a real off the wall question? 1999 Isuzu npr box truck 14 footer, exhaust brake is bad or seized up. can I make a manual lever type to engage exhaust brake on and off instead of electric or vacumm type?

[@kerrygleeson4409]

Thanks for sharing 👍🇦🇺

[@guyconnell2250]

I always wondered what it was/is about Precup engines that precluded Jake brakes. I know they had the Cat retarder and that it is completely different and not in the conversation. The DI 3406 engines of the late seventies into the 90s had jakes. But the precup engines did/do not. Why?

[@brucelee64485]

In the 3406A era of the early 70's the Jake brake was still pretty new technology that had not gained any traction in the industry. In the 3406 A, and early B era Cat did not even acknowledge them and the truck manufactures had to take the engine apart, and install the Jake kit as a factory option. I think even in the early 90's they were still taking the engines apart and adding the brake kits still. Cat wanted to sell you the brake savers on our engines instead of the Jake brakes. It was not until 95 when the E model 3406 engines came out that I know that the engine was designed from the start to have the jake brakes built in at the Cat Factory during the assembly process. By that time it was so common to have engine brakes that when we would get one without the brake housing on top the inside of the engine looked wierd to us! The original A model engines also did not have the beefed up exhaust valves and the Jakes were kinda of known for being hard on the valves and breaking the valve heads off. Cat changed the make up of the valves later on the B engines and as the original heads came back through for reman purposes the A models got the updated valves in them at that time. At that time we had to go directly to Jacobs manufacturing to get parts for the brakes just simply because they were considered an add on aftermarket and Cat would not carry the parts to fix them. Now that Cat and Jacobs got in bed years later in the development of the Cat brakes on the later ACERT engines they carry the parts through the dealer network.

[@didactic318]

Thank you for this great explanation. I just have one question: how does restricting the exhaust gas flow in an exhaust brake system slow down the engine?

[@thomasglynn2282]

Question, which is a more effective engine brake? An engine with mechanical unit injector (older Cat Cummins) or an engine with injection pumps (Mack, ISL, ISB Cummins)? I installed a lot of Jake's in the 1980s and the older Cummins engines you had to remove the exhaust rocker arm off of shaft and grind it down on the sides so the slave piston would pass by to reach the top of the exhaust valve spring retainer.

[@anonymous4507]

What depicts how well the Jake brake works is the compression ratio of the engine. The higher the compression ratio the better the brake.

[@thomasglynn2282]

@@anonymous4507 correct, also engine brakes work better on large bore engines

[@ecksdog]

Great info. Thx

[@RichardJW1]

excellent...many thanks

[@rodrigofabregas7756]

Nice video....thank you!

[@Rekuzan]

The Fucked-liners I used to work on back in the day (some K-dubs, but most Freightliner) had front/rear bank jakes on them. IE: 2 toggle switches on the dash; one for the front 3 and one for the back 3, and normal operation of thus entailed flipping both at once. I never understood why Cat didn't just wire everything through the same switch...

[@tomcline5631]

My 2000 FLD 120 has two toggle switches,says 2 cyl and 4 cyl. In the 05 and 06 Colombia's we have are just high and low and don't work in low side of the transmission. I've looked them both up,and just from experience with them,the high/low on the Colombia's Detroits are 2or 4. The Cummins(redtop n14) in the FLD is 2 and 4 and works in all 10 gears! When you turn both switches on you got All 6 cylinders braking! Even with 656k miles on it,it will still rock you right against the the steering wheel! Much prefer the system on the FLD!

[@michaellongo6478]

Hey Josh, Can you purchase just the actuator on the C7 exhaust brake, or does it only come with the whole valve?

[@derrickzenner9300]

In a class 8 truck an exhaust brake is very aggravating. Mercedes/freightliner should have never done that. Great video

[@Darth-Nihilus1]

Our 6v92ta and Cummins ISM have a mean sounding Jake 😍 our C12 MBL would sound better if I straight piped it but my Fire Chief said no because we did that with the 6v92ta and it screams

[@TheCRTman]

Which fire station/ city & state?

[@Darth-Nihilus1]

@@TheCRTman Turtle Creek Pennsylvania station 283 and 211 West Wilmerding up the hill about 1/2 a mile

[@TheCRTman]

@@Darth-Nihilus1 Nice! I'm out here in San Francisco, but there's still 3 8V71 hose tenders left today

[@Darth-Nihilus1]

@@TheCRTman the 8v71n and T were good motors but them straight piped just rip your ears when you are in the cab

[@TheCRTman]

@@Darth-Nihilus1 Definitely, I love them. LMAO indeed. They sound real mean with a worn muffler though.

[@scottsenft4201]

Add in for maintenance on a lot of the vacuum exhaust breaks I've come across requires a regular cleaning of the vacuum solenoid about every 6 months...

[@dminter1234]

I have a chevy kodiak with the duramax engine, it has the vgt turbo and it uses this for the exhaust brake function. There is some added noise as the engine rpm's go up considerably when the exhaust brake is active. Also interesting to see the boost guage go up when the exhaust brake is operating.

[@Icutmetal]

Part of that is the Allison transmission’s grade braking as well.

[@mattywho8485]

If the "engine RPM's go up considerably" how is that slowing down the vehicle ?

[@iBackshift]

Super Good as usual!...Reason why I dont have TV.

[@Icutmetal]

I make the Jake brake sound in my helmet every time my sled backshifts creeping down a hill with your clutch kit😉

[@drop7vogue]

Interesting. I don't have any auxiliary brake on my RV, it's a real pain in moutain drive ! I have the 3208 cat and it seems that this engine has not enough compression to get an effective jake brake. The only way to me to get an auxiliary brake is to install an other transmission, not enough of room to install an electric brake unfortunately. Thanks for sharing !

[@terrycrowder8430]

Love it!

[@robbrenton9438]

I love YOU, man !

[@fattmouth7715]

Jakes also hold on the down stroke as the exhaust valves are shut the piston creates a significant vacuum on it's way down. Great video 👊

[@eugeneoreilly9356]

So how does it compress air if none is entering the cylinder?

[@fattmouth7715]

@@eugeneoreilly9356 It is compressing the air. The valves open and let the charge out precombustion

[@badgerpa9]

@@eugeneoreilly9356 exhaust valves are shut on a down stroke always, the 2 downstrokes are either intaking fuel (unless injected) and air with inlet valve open or the power stroke.

[@AndrewBrowner]

@@badgerpa9 well theres no power stroke as there was no fuel added and all the air that was compressed for a power stroke was popped out the exhaust valve when the jake opened it, if it closed the valve before the piston made its way back down itd create a vacuum in the cylinder as the intake would be closed since its suppose to be having a power stroke at that time, then there would be a pretty uneventful exhaust stroke followed by an intake one and were back at the start where its going to compress that intake air then pop it out the exhaust before it returns that energy into the piston as it pushes the piston back down its just removing that compression energy on every 4th stroke, maybe adding a little bit of drag in between each of those

[@badgerpa9]

@@AndrewBrowner So suddenly an engine does not have a power stroke if it has a Jake, it still has a power stroke just not creating power. The name of the stroke does not change. The engine still does the same stroke the piston always does, if you think suddenly the piston does not move or something you need to go back and learn the basic engine strokes.

[@danarnold9557]

Awesome thank you 👍

[@observation2384]

Great Information per ONE on ONE

[@colonelmann]

I'm selling my freightliner with the C7. My new truck is Cummins. Know an Adept Ape type channel for Cummins? Im still subscribing, your information is pretty universal. I've learned more here than anywhere! (Wear your hat however you like)

[@AdeptApe]

There is a guy named Rawze or something similar to that. I know he does or did Cummins videos. Never met the man, but might want to start there.

[@AmaroqStarwind]

I'm still trying to find information on brake saver systems, but I'm not having much luck.

[@dantrockman879]

kzbin.info/www/bejne/i2fOh6uKltt9ptU

[@Gkitchens1]

Hypothetically you can use an exhaust brake system on a truck equipped with a jake brake. It could potentially improve braking ability, but I'd be willing to bet in most systems, it would just make the jake bake system work less efficiently. The point of a Compression brake is to let all that high pressure air escape quickly at the, well, wrong time. If you then restrict the exhaust, that air has no where to go and it doesn't escape the system quickly. Thus you lose efficiency. Conversely, if done right, this could work by essentially reversing the airflow in the engine or at the least nearly stopping it entirely. It's not. Very good idea and theory isn't the same thing as real life.

[@randygonzalez6250]

Efficacy of the compression brake relies on the turbo charger which itself relies on unobstructed exhaust flow. If exhaust flow is restricted, the turbo's boost wanes thereby detracting from the compression brake which is itself much more effective than an exhaust brake, so it really is either or...the clearer choice being a compression brake if you need the stopping power. Alternatively, if say you had a supercharger instead of a turbocharger, then what you're saying is absolutely right, you could literally add the two stopping forces together very effectively....& probably to the point of stressing the engine & drivetrain too much! But the argument against using superchargers is that they use more energy from the engine than turbochargers to function.

[@Eric2300jeep]

And here I am with a factory installed Jacobs Vehicle Systems Exhaust Brake on my 5.9 Cummins confusing the shit outta people when I explain I have a Jake but, it's not mechanical 😁

[@joemcmillen783]

Josh, Can you explain how to service the exhaust brake on a CAT C-9 engine. Is there a maintenance procedure?

[@juanlemod]

As trucker with 4 years of experience, I want to install a Jake brake on my 2005 Corolla. I heard that some pick up diesel trucks but I don’t think I heard of a gasoline-powered vehicles. I simply want it because I like slowing myself down without pressing the brake pedals. It might not make financial sense, but I still want it, lol.

[@gabeford895]

So... what if you pulsed the exhaust brake in between each Jake pulse so the cylinder dump pressure dump hits a closed wall, but still much more volume than the cylinder so the air will rush out anyway until pressure equalizes, then when the exhaust valves close, open the exhaust brake? A lotttttttt more expensive to build something like that, but still

[@magnumjohnson9628]

Hell yeah!!

[@gerardojimenez36]

Legit explanation.

[@ThePaulv12]

In a Jake, the spring effect of the compressed air built on the compression stroke is stopped from being returned to the crankshaft. ie like a bicycle pump. Squeeze the plunger until TDC with your thumb over the hole, then at tdc remove your thumb! The compressed air is released immediately stopping the pump plunger springing back.

[@stevek6921]

Hey Josh, new sub here. I've got an RV with a C13 and a three-position Jake brake, which works really well. I'm curious: What actually changes between settings? Are the opening/closing times of the valves changed between Jake settings or is it something else?

[@bigddieselrepair2275]

Its the number of cylinders it activates.

[@interstate5trucker]

Your engine is an in-line 6 cylinder. Setting one would activate only the 2 middle cylinders, setting 2 would activate only the 4 outer cylinders and setting 3 activates all 6 cylinders.

[@badgerpa9]

He has a video on this.

[@jrhpdx]

I just bought a 23 AT4 HD and have a question. I have heard people say only use while towing and not to use it any other time. Here is my question. Should I always enable exhaust brakes for city/highway driving or only use it when I am towing?

[@davecalico3273]

Josh, any experience w/int.7.3? 2003 Ford 350?

[@terrycrowder8430]

Thanks!