How To Test & Replace the Brake Booster and Brake Booster Vacuum Hose

Today we'll be showing how to test and replace the brake booster and the brake booster vacuum line. The vacuum line tends to be an easy repair for most vehicles. The brake booster is a bit more involved, nonetheless, it's certainly something the novice mechanic or dyi can accomplish at home.
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Any attempt to repair automotive parts and/or systems carries risk of personal injury. Always adhere and follow safe practices when working on vehicles. Such as, safety glasses, jack stands, no loose clothing, etc. No guarantee or warranty is implied. Use the information in this video at your own risk. Carsntoys is a member of the Amazon Influencer Program.
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#brakebooster

[@spankymagee]

Well you just saved me $449. I had almost zero brakes. Maybe 5% and it was stuttering the engine idle, trying to die on me. It was just some little T barb in the vacuum line had a cap fall off. I put my finger there to plug that open T and the idle improved. So i found a screw and rubber.and made my own plug, and brakes working as should again. Thanks!!! P.s. i just so happened to have a Honda Vtec too (08 CRV), so the similar visuals made it super easy to check lines As a note for others, my brake pedal was extremely solid and wouldnt barely move up or down even with tons of force applied. Having car running, they felt the same as the car off. All that power lost from a tiny hole in the line. Now I'm back in action! Thanks again!!

[@TheTalkShytShow]

I'm having this same hardness issue with my brake pedal, except when I press brakes slight the idle goes up, and when I press the pedal really hard the idle drops to normal idle

[@steven9492]

my mans even completing the video during a rainstorm

[@happyjoyousandfree6721]

Real MVP

[@saltycreole2673]

He finally took a bath! (Just kidding!) 😂 Mechanic humor can be vicious.

[@Diesel-ug4pd]

Thats ur man? Dammm bro, congrats!!🎉🎉 🌈🌈🌈

[@user-rb6iy2lq8p]

He must be a Company Man

[@alrickchristian9430]

From h6 ​@@happyjoyousandfree6721

[@gerrypoulton7767]

That was about the clearest video and verbal explanation I have ever seen . Thankyou

[@biffb863]

I don’t know what it is, but your explanations, your descriptions, and your demeanor was very helpful and as simplistic but yet exactly what the doctor ordered!! Thank you good sir!!

[@mgaston2496]

Excellent video and explanation. I will be using your tutorial to diagnose the hiss when my wife pushes the brake in on her cord edge. Thank you for taking the time to being this to us, well done.

[@edizzle4shizz]

Air seeping sound under hood & loss of brake pressure brought me here...

[@MakeLegacys]

Find a solution?

[@ThatBeardedGuy69]

Check your seal on your master cylinder where it bolts to the break booster. Or it could be the master cylinder it self. Or your booster.

[@edizzle4shizz]

@@MakeLegacys yes it definitely was brake booster & master cylinder

[@edizzle4shizz]

@@ThatBeardedGuy69 yes it definitely was brake booster & master cylinder

[@mfsusanoo7238]

For me it's air seeping sound coming from near the brake pedal, I dont even know wtf that means 🤦

[@g-man5809]

Thanks, I just changed the master brake cylinder and driverside brake line, both front side calipers and brakes in the front (driverside caliper wasn't opening fully dragging), bled the entire dark color brake fluid system out too, but still not 100 % I believe it's the booster, the brake pedal area I hear a air noise...I have the new brake booster in my garage ready, ill do your trouble shooting first, thank you sir!. Details: just got my truck 2nd hand 99 F150 V8 4.6 ABS 230,000 miles

[@janetsanborn5803]

Great job, thanks for your thorough explanation and multiple tests.

[@traumajock]

A few days ago, I changed the cooling fan in a Kia Soul I bought from my nephew. To do that I had to remove the intake. When I backed it out, I noticed a very hard brake pedal. I could hear a hissing sound. After watching this and a few other vids, its pretty obvious a line is disconnected or perforated. The brakes worked fine before the cooling fan job. And I was about to drive the damn thing to a Kia dealership. Many thanks.

[@theSilvioRoesler]

same issue on my VW CC - need to find the leak!

[@darrentalyaga6714]

Thankyou man. Great easy steps for diagnosing boosters. Watching all the way from Papua new guinea

[@lescobrandon8162]

Rubber hose on the vice grips is a very very nice touch, great idea and I’m totally doing that

[@theSilvioRoesler]

Awesome, video, very detailed. After removing the air intake to do some maintenance I now have a hard brake pedal - I am pretty sure I have a vacuum leak, and this video shows me exactly how to troubleshoot

[@CarsNToys]

Glad it helped!

[@EddieUltimateChampion]

This video was so helpful! Thank you for your time. God bless you sir.

[@temirtaragay8932]

One of the best videos in my opinion. God bless you!

[@harizaziz3280]

Thank you for sharing your knowledge! Very useful.

[@ryanbishop3781]

Thank you for such a thorough video!! Thank you for also linking to the master cylinder video, that is infinitely helpful. Very informative.

[@Ktea_x]

Very useful, thank you. I brought a bmw 1 series last month and for the first time today I was unable to start it as the brake pedal was rock solid. Tried multiple times but gave up and I rang my dad. Typically, it started for him first attempt with no issue... so he thought it was a me issue until we started reading some forum posts and found out about this issue

[@danthonyg26]

Ty!!! I need to found out what's wrong with my braking and this vid definitely helped!!!

[@CarsNToys]

Glad it helped!

[@Mark-dq6lr]

Very clear and understandable ! Thanks .

[@weimarutube]

Outstanding video! Thank you

[@dgonthehill]

this BIG help, to see if brake booster bad, appreciate SO MUCH ty

[@dgonthehill]

also the shady mechanic said master cylinder when hard brake, he just after money ty for saving me money

[@nonameduser801]

Awesome video explanation, just did all the tests everything fine, no leaks based on your test suggestions. Yet, still pressing the brake pedal makes RPM increase. What to test, look for next?

[@v2iper]

Excellent instructions, you are a good teacher

[@Fashion-Cybersecurity]

Great job. A very smart and intelligent man.

[@jrjohnson9723]

Thanks very insightful video! Appreciate your dedication as well.

[@ryecassgei]

Very well explained. Thanks for sharing your knowledge.

[@CarsNToys]

Happy to help.

[@kirkmabbitt9837]

Best explained video I've seen! I do have a question if you have a min to answer? If booster or cylinder go out, will there be signs of fluid leaking? I've followed the steps in your video to check for leaks but I couldn't do the clamping of the hose because there is no valve except for right at the booster!

[@reedbertsch174]

Thank you! I wish I saw this before I replaced my master cylinder. I thought the rod (going to MC) was a solid rod going right to your pedal. Being as it solely relies on pressure to engage the WHOLE braking system, now it makes a lot more sense to me!

[@calvindavis7643]

Great vid! Thank you. How do know if your check valve is bad?

[@jrod8382]

This helped me today. Great video.

[@voiceinwilderness7]

Thank you. I used this video to identify where my brake booster hose is located....need to do a smoke vacuum leak test and needed the entry point :)

[@CarsNToys]

Glad it helped!

[@enriquev8832]

Thank you. I believe my brake booster hose has some sort of o-ring and I’m afraid that of I pull it too hard, I’m going to break the fragile plastic components on the hose (N52, 2007, BMW 530i). I’m chasing a vacuum leak and a smoke test revealed nothing. My plan was to remove the hose and cover it with my thumb to see if my short term fuel trims got better. But you just gave me a better idea! I can just pinch the soft portion of the hose to accomplish the same test. So thanks again!!!

[@petelewis6787]

great video,thanks keep up the good work

[@GeekAcademyInc]

Thank you very much, this information provided as thorough and detail. 👍🏾🇹🇹💯🤓

[@tonistarks2874]

Thank broski! I needed this

[@gracienjclaude2258]

Great video thank alot my issue was the vacuum line.

[@michaeldorosh4060]

Wow,great video well explained.I’m on it thx to you..

[@garyforester4749]

Exactly what I needed. Thank youuuuuuuu

[@st.michaelthearchangel7774]

Great video. Thanks!

[@Kkamp]

Great tips bro. Gonna do this to my 72 camaro

[@bgking35]

Awesome video bro ! Ty

[@miltonjohnson6657]

Nice video sir! Thank you 🤙🏾

[@Pay_attention_Benny]

U are a legend, helped me out so much ❤

[@davidgibson8523]

thanks for the helpful video, job done!

[@volvagia6860]

Great video! Thanks for the help!

[@ShinkuGouki]

Great video explained very well.

[@kinchu007]

Thank you very much!

[@erminkesten3184]

Thank you very much sir. This was very helpful

[@islandbeaches395]

You can pull the hose off the intake and have someone pump the brake pedal to verify the check valve working.

[@linoguglielmo141]

Thank you for your through explanation 👍

[@rjperez1554]

Very informative.

[@avery214j]

Good job and easy explanation too

[@luciano5137]

Great vid! If you change the hose do yoi keep the check valve or buy new hose with new check valve?

[@maileevyne5000]

This was very informative. 😁 Should I be worried about doing myself?? Play it safe and take it to the shop instead? 😅 I changed my own brakes watching KZbin videos.

[@johnnyls4381]

Great video ! Thank you!

[@amoney31aplus28]

Thank you for this video I know have a better diagnosis on my Cadillac ATS power brake booster issue

[@gr2262]

3:25 there is no need to clamp down the hose, all u need to do is disconnect the end going into the intake and put a 14mm bolt on there and that will seal. Most people will eventially kink or cut the line of not done right.

[@kcripk]

Super helpful!

[@srinivaskunani]

Very well done video

[@omarlimousinetaxiservices4307]

Great thanks good job

[@cards06champs]

Nice video! I currently have 2003 f150 that has leakage between master cylinder and brake booster. Not sure what's going on but brakes not preforming well.

[@rockiemountin7535]

Great video thanks for posting

[@ehsan19]

Must say a great video bro, Would like to ask I have Ls430 2001 and got the code error 1578 Brake system. Could you tell me which first I can perform as a check up since my cruise control and VSC just stop working after this code.

[@cperez1263]

Great Video. Thanks bro.

[@genobrn8743]

Great video, thank you

[@user-ce7rv5sb4m]

Very useful

[@marieq3668]

Thank you for this clear and easy to follow video. For the first test, my break pedal went DOWN at ignition off, then stayed steady. Other tests were the same as in the video. There is no warning light, but with ignition ON the brake pedal hisses and is too easy to press, and this happened very suddenly. 2018 Outback. Edit: after some additional research, I believe the check valve may be right where the hose attaches to the booster...but I'm not sure, there is also a hard bump in the hose that may be it (I assumed it was the bump for the clamping test) I will try to find instructions to remove and check it.

[@AudreysKitchen]

Hey Marie. Any results to report? Thanks

[@marieq3668]

@AudreyCooks actually I ended up taking it in, and it turned out to just need new brakes (pads and discs). After they were done, the pedal feels normal, and it only hisses when I press it when already fully stopped, not during normal driving. They told me such hissing is normal, and demonstrated on another car (a Legacy). I'm still sure it was not doing this before, or at least no where near as loud, but since I now only really hear it right before I turn ignition on, I guess that's OK. I also confirmed a 2020 Forester did it, which made me feel better. Maybe it's a Subaru thing?

[@EldenPhoa]

Thanks for your help.

[@cryptobeak5108]

Awesome video Bro!

[@92nredrappini84]

Thanks a lot my 92 Corvette brake was making it difficult to stop with your info I can check to see if it's the booster or Check Valve thanks.

[@bubarides110]

Super great helped me save a lot of time

[@CarsNToys]

Great to hear!

[@omarq1414]

I am hearing a hissing sound from that area on my accord. I used soapy water to check for leaks, but did not produce any results. I will try this, thanks for the video.

[@ricko3k]

Great vid thanks.

[@jesse73772]

Thank you so much

[@Dnasty1]

Great video. My booster hoses are all hard plastic. I was wondering if I can simply unplug it from the intake to do this test?

[@hellraiser12b]

Thanks man you helped a lot

[@CarsNToys]

Glad I could help

[@qzorn4440]

great video... i have a dodge 2006 pickup... there is a lot of brake fluid on the engine and the brake pedal goes all the way to the floor... could this be a bad booster? thanks.

[@Scrapla1]

I have a 07 Tacoma and randomly my brakes will lock up while driving and the only fix I found is to unplug the vacuum off the booster for a few seconds and this usually lasts a while. My factory booster did this and now my rebuilt used Toyota OEM one started doing it after about three years after being installed.

[@robanimahizan9186]

thank you sir! now i found my problem

[@CarsNToys]

Great!

[@westimportcars]

Thank you!

[@claudelbellony3313]

great job

[@Reach3DPrinters]

Thanks

[@munirahmed585]

Good job sir

[@jc-kj2on]

Thank you, very informative

[@MySweet1981]

This was very helpful, thank you.

[@mekanikobisdak4490]

Very Helpful

[@CarsNToys]

Glad it helped!

[@saeedhaydari9925]

Thank you brother

[@CarsNToys]

Happy to help!

[@kalpeshkapadia4623]

Thanks sir

[@Promethium666]

thank you very much

[@robertogomez8100]

Great video you always explain things the easy way. I performed the first test twice and the pedal stood still for the whole 30 seconds, does that means that my booster is ok? THANKS AGAIN FOR YOUR VIDEOS. .

[@CarsNToys]

Yes. If there's no change in pedal height you're okay. Thank you for the feedback!

[@renegade9758]

@@CarsNToys hello my grand cherokee stalling when i push the brake at the stop .its the booster brake its die???

[@tahirtalpur98]

​@@renegade9758 you probably have a vacuum leak and air is entering the intake manifold

[@ramonfalcon4506]

Great video….u explain very well…I too have a Jeep 2000…I did everything u did…however when I apply brake…it takes a while to stop…it stops but slow….I followed all your steps….any suggestions? Aloha

[@terricanavan7648]

Thanks!

[@joshtimmons7332]

Awesome vid

[@lescobrandon8162]

For that depth test on the brake, could the culprit also be that there is air in the brake system and that’s why the pedal is getting firmer?

[@hemnosman5940]

THANK YOU

[@3rik_3vo]

Thank you for all the information! I came across an issue where when my car is on and I press the brake repeatedly it will change the engine speed as if the car wants to shut off and my AF/R gauge will go lean, do you think it could be the booster? Thanks in advance man!

[@jayvirtusio1081]

When I step my breaks and realease it.i can hear whizzing sound air coming out.that it means need to change my vacuum boaster for ml320 year 2000.appreciate your help.

[@bosanovaboy]

Excellent

[@creaturet5296]

THANK U SIR

[@bosanovaboy]

Thank you for the video. Question, when my car is idling on I press the break down and when I let go the RPMs jump about 200-300. So far I looked at the vacuum hose don't see a crack or hole