Question about 1995 Pontiac Grand Am

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When foot is on brake it hisses under dashboard rpms rise brake goes all the way down what is the problem

1995 grand am when foot is on brake it hisses under dashboard rpms rise what is the problem brake pedal goes all the way down

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This is your master cylinder diagraphm is having a problem. It will either need to e repaired or replaced. The master cylinder is located behind the firewall right behind your motor on the drivers side of hte vehicle

Posted on May 21, 2009

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Hissing sound brake related


hissing sound is a vacuum leak somewhere on the power assist part of the system as in a bad booster..try this test..with the car off..push the brake pedal down a few times and release all the vacumm and see how far the pedal goes down..after a few pumps with your foot it should become hard and drop just a bit..once it feels"solid' or hard..hold the pedal down with moderate pressure.. and start the car back up..the pedal should drop a bit further but less than halfway.. if it drops further it needs attention..good luck especially if it goes almost to the floor..

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I get a hissing sound by my brake peddle when I apply my brakes and it does not go away. When I run the engine and depress the brake peddle and hold it there and turn the engine off the brake peddle...


Your bake booster has failed causing a massive vaccume leak when you apply the brakes. That in turn gives more air to the system so the computer tells it to add more fuel thus causing the rpms to go up. Replace it %99.5 chance that will fix it.

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2004 jeep grand cherokee special edition engine light on take foot off brake doesn't creep forwar, put foot on gas rpms go up but jeep only goes about 15 mph. THEN it worked just fine!!! Now the lights...


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I have a 1998 grand cherokee laredo... recently i noticed a slight hiss noise while diving. when i put my foot on the bake its stops but after im done braking the hiss noise increases then slowly goes back...


rubber around what pump is ripped? Wherever it's leaking you need to fix that. Locating the actual leak can be done by putting a short length of hose to your ear and using the other end as a probe. As you get nearer to the leak source the hose will allow you to pinpoint it to an exact location.

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Slight air hiss or sucking sound near brake pedal and no


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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1 Answer

Problem with Brakes


Listen under the dash where the rod goes into the back of the booster if noise is from there, it's leaking.

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