Question about 1997 Chevrolet Lumina

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Power booster 1997 chev lumia when i step on the brakes i hear a hissing sound or air leak and the car startsrunning rought

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Replace the power brake booster. there is a rubber boot inside the booster that has a hole , and when you depress the brake it opens the hole.

Posted on Sep 27, 2008

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Why would my brakes hiss when I step on them and cause the engine to rev up when I do this? It also makes the vehicle very hard to stop.


It sounds like your brake booster is leaking. The air hissing is the air going into the leak. This extra air goes into the engine and causes the engine to rev up. The booster is what makes it easy to push the brake, (when it is working correctly) which is why the pedal is hard to push.

May 31, 2012 | Chevrolet Blazer Cars & Trucks

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Why do i hear air when i press the brake pedal


well, you don't really hear air when you press the brake pedal. You might hear hydraulic fluid going through the valves in the master cylinder, that sounds like air flowing through a vent. But, I assure you, it is not air.

One can press and pump on the pedal when the car is off and hear the 'rush' of fluid which sounds kind of like air rushing out of an inner tube.

It's a common mistake to believe a rush of air is being heard when pushing on the brake pedal.

Aug 26, 2010 | Chevrolet S 10 Cars & Trucks

1 Answer

When I step on the brakes I hear a hissing sound. The breaks ar mushy and the RPMs increase when I am in park and I step on the brakes.


That sounds like the power brake booster unit is faulty and it will require replacing the power brake booster unit to repair the vehicle. Also, check to see if there are any vacuum lines running to the brake switch(s) on the brake pedal lever that might have come loose or are damaged.

Aug 15, 2010 | 1997 GMC Sierra

2 Answers

Hear an air sound when pushing on brakes is it because they need replaced?


No,it does not,this is the brake booster,witch is leaking,but if it does not effect the engine,and you still can touch the brakes to stop,then you are fine,

Jul 09, 2010 | 1997 Chevrolet Blazer

1 Answer

The brakes on my daughter's 1997 Pontiac Sunfire hiss or sound like air when she presses them. The fluid doesn't seem to have leaked yet.


you need to lay on the drivers floor and push the brake pedal while engine is running to see if the brake booster seal is leaking,if it is thats vacume leaking that you hear

Jan 12, 2010 | 1997 Pontiac Sunfire

3 Answers

Brake hisses under the dash when i step on the brake pedal


this is caused by a defective leaking vacuum (that is the hiss) power brake booster diaphragm, replace the power brake booster.Use the link below for general instructions on replacing your booster, it is a diff car but the same type of part is on your car.
http://neptune.spacebears.com/cars/stories/booster.html

May 20, 2009 | 1995 Pontiac Grand Am

1 Answer

Brake light on, power brakes seem gone


Chk. for vacume to booster, or loss of vacume like a break in vacume hose, do you hear a hissing noise when you step on break peddel. If you don't hear anything chanses are its the booster. When peddel gets hard to push you either lost vacume or booster went bad.

Mar 08, 2009 | 1997 Ford Contour

1 Answer

97 Blazer brake pedal making hissing sound


Sounds like a vacume leak from power break booster, when you loose vacume it will stall out the engine if enought vacume is lost. chk. power break booster. and hose from engine leading to booster for vacume leak, booster is under hood, break master cyl. bolts to it.

Feb 21, 2009 | 1997 Chevrolet Blazer

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