Question about 2000 Jeep Grand Cherokee

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Air leak sound around the brake pedal.

Once I start our 2000 Jeep GC Laredo there is a hissing sound (air/vacuum leak) down near the brake pedal. I have looked around but can't see any obvious point of origin. As I apply the break the sound increases/decreases but is always there. We drove a couple of miles and the sound stopped shortly after I applied the breaks and released but did it everytime I used the breaks. Any suggestions?

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  • 4 more comments 
  • dbkiggins Nov 12, 2008

    That was the problem. Thanks for your help.

  • Shortydog Dec 26, 2008

    I have air leaking out of the brake pedal assembly as it meets the firewall. Is this a brake booster in need of replacing or what

  • Anonymous Jan 17, 2009

    1999 jeep grand cheokee hissing noise at brake pedal around rubber boot.

  • kjsasmith Jan 27, 2009

    My sons 99 Jeep Grand Cherokee started doing the same thing; hissing (sucking air) where the brake push rod passes through the fire wall. I'm going start by going cheap charlie, replacing the Power Booster Check Valve. Jeep dealer says it will take 1 week to come in from Milwaukee (OEM part). Checker says they have them on the shelf for under $7.00. Local NAPA doesn't carry them.

  • barryammons Mar 07, 2009

    Can someone provide instructions about how to replace the brake booster?

  • d_reamweaver Mar 25, 2009

    air hissing sound while car is running,it stops when you apply brakes



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It it a brake booster problem.I am changing mine this weekend.You can get a new one form autozone for 149.00 or get one at the junkyard for about 70.00.I am installing mine this thanksgiving.I can send you the step by step instructions if you like.I have a 99 jeep grand cherokee limited edition and for once i thought i had a snake in the car..

Posted on Nov 27, 2008

  • 3 more comments 
  • Tra9261 Nov 04, 2010

    fobyfo - could you please email me step by step directions. My email is

  • Benjamin Hall Dec 12, 2012

    Would you please email me the step by step process, it would be greatly appreciated. Thanks-

  • angelo galasso
    angelo galasso Dec 04, 2013

    can you please email me as well the step by steps. Thanks

  • Roshelle Templeton
    Roshelle Templeton Feb 02, 2014

    If anyone still has the step by step instuctions for this repair can you also email them to me Thank you

  • Scott SElf
    Scott SElf Apr 01, 2014

    can you please email me as well the step by steps. Thanks


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  • 160 Answers

Sounds like a brake booster problem

Posted on Nov 11, 2008

  • Tra9261 Nov 04, 2010

    Did anyone get resolution on this. My 1999 jeep is doing this now too. I need to know how to fix myself. Thanks



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Car looses power when brakes are pressed. In my 91 Buick Regal.

I wonder if you have an air leak in the brake servo? Check the manifold vacuum as you operate the brakes. Look for bad hoses around brake servo.

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Car sounds like air is coming from somewhere and not getting no power

You have a vacuum leak, a bad one so it sounds. If the sound is a hissing sound, and it is coming from inside the car, by your feet, in the middle of the pedals, it is probably a brake booster leak. If the brakes are suddenly harder to use ie. you have to push real hard. the hissing is a good indicator that you have a vacuum leak. if the brakes are unaffected, its still most likely a vacuum leak. look around and find that leak.Once you find it (probably a hose). Plug it with something like screw (a long one that fits, is easier to find if you drop it). Then youll need to locate the other hose from which it broke. You may find a kit or something to repair it, but the best solution is to follow it to the other end and replace the whole hose. I just ignore my hissing, it is the brake booster, but ive gotten use to the extra pressure i have to use, and i know that a car thief would not know how to deal with my braking
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There are 2 things that can use vacuum near the brake pedal. If you have cruise control, there is a safety switch on the pedal to shut off the curise when you apply the brake. This switch may be leaking.
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There are some solutions for this kind of problems:
1. change your brake fluid (BF). This need to done regularly every three yrs. , at hard condition's every two yrs.
2. check the caliper. It's possible that one of the two pistions inside the caliper don't work properly (mud or rust inside)
3. check if the brake bads can slip free over the anchor, if there are some rust on it, remove them and check the surface, if damaged, replace the part.
4. check the caliper slide pins. If the caliper can not slide, it will stay in contact with the brake disk, this will heat up the bad and disk and make a noise.
5. check your brake booster (vacuum test required). If you switch of the engine, listen if your hear some noises (air leak!).
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1 Answer

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It maybe, I don`t know the vehicle personally but on Trucks and Buses, when this occurs, it usually points to the master cylinder piston seals which moves in and out as the foot pedal is operated. Does the hiss alter as the pedal is pushed down?? Does the hiss reduce or increase as the pedal is pushed down?? If it does, I think you`ll find that it`s this air seal between the piston and cylinder that`s failing and not the servo. Whether you car works the same way, I don`t know but I presume it must. Ian

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