Question about 1999 Jeep Grand Cherokee

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Brake Booster My '99 Grand Cherokee just started the hissing noise today. Do you still have those step-by-step directions for fixing it?

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  • Anonymous Mar 28, 2014

    hissing noise



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Is it in the compartment and stops when you hit the brakes if so then it is your brake booster.

Posted on Jan 24, 2009


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You have a leaking power brake vacuum (this is what you hear) operated power booster. Go to this link to read the procedure of removing and pacing the power brake vacuum booster

Jul 12, 2012 | 1996 Jeep Grand Cherokee

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99 Jeep Grand Cherokee-air is whistling into the passenger compartment through the brake pedal rubber boot underneath the dash. how to fix?

you need to check the power brake booster canister it sounds like it is leaking vacume past the seals

Dec 27, 2009 | 1999 Jeep Grand Cherokee

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Leaking brake fluid + Faulty cruise control

If you see fluid at the rear of the master where it attaches to the power booster then the cylinder itself is leaking. It's not often that the container leaks.
The hissing noise is very likely coming from the power booster. This must be replaced. If cruise has a vacuum hose that connects to hose to booster it's possible that vacuum loss at booster is causing the cruise problem.If you are going to do the booster, have a good tech take a look at it first. they are expensive and you don't want to change it on my advice alone...I'm not there and can't hear it!

Mar 24, 2009 | 2004 Jeep Grand Cherokee

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99 jeep grand cherokee

the noise you hear is probably coming from the power booster for the braking system, i would ge it in and have it checked as soon as you can

Feb 21, 2009 | 1999 Jeep Grand Cherokee

1 Answer

2000 Jeep Grand Cherokee brakes make a hissing noise

has your brake pedal seem to be stiffer than usual? the sound you hear is from the brake booster if it has a leak it will cause a noise but you would have a stiffer pedal because the booster is loosing vacuum.

Feb 08, 2009 | 2000 Jeep Grand Cherokee

3 Answers

Brake makes a hissing noice when depressed

It may be a few different things, most of them relating to the brake booster. It could be a vacuum hose is loose or ripped (a simple fix, just replace the hose) which would correlate to a hissing noise outside the car. If there is a hissing noise inside the car it could be a tear in the booster on the inside of the car (trace the brake pedal up, at an angle, and then into a rubber 'boot' or 'fitting'. This is called the firewall by some people. With the car running (but in park) feel the rubber boot and see if you feel any air releasing, or if the noise diminishes when you cover certain parts of the boot). A tear internally means you need to replace the brake booster itself in some cases. This is a bit trickier to pull off if you don't have the experience.

Here is a picture of a standard booster/master cylinder.

Another (DANGEROUS) option if the booster itself is leaking is to disconnect the hose from the brake master cylinder, and clamp it off/plug the hose. This is the equivalent of having manual breaks, and will require a lot of pressure to engage the brakes (normally you are compressed air assisted by the booster). The only reason to do this is if the tear is large enough that you are losing engine power because of it. This will allow you to get to the next exit, next gas station, or (in some cases) 3 states away.

Jan 26, 2009 | 1999 Jeep Grand Cherokee

2 Answers

Air leak sound around the brake pedal.

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..

Nov 11, 2008 | 2000 Jeep Grand Cherokee

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