Question about 1997 Chevrolet Blazer

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Brake pedal hard to push and hear air rushing in near pedal

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Brake power booster has failed, replace.....

Posted on Jul 19, 2009

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Have to push the pedal to the floor to get car to stop. Fluid levels fine.


If the pedal really is going down to the floor you must have air in the system and you are compressing it. It is possible to get a very minor leak that lets air in but very little fluid out. If the pedal is going down to the usual level your servo could be acting up. If you get somebody to run the engine and then stop it and press the brake pedal while you listen under the bonnet you should be able to hear the air rush in when the atmospheric valve opens. If it doesn't you may have a leaking hose or the atmospheric valve is not working properly.
Another possibility is seized pistons in your calipers or they are rusted up and sticking. If you jack the car up and get someone to press the brake pedal and see if it locks each wheel in turn, when they take their foot off the pedal you should be able to turn the wheel by hand. If the wheels don't lock when the foot brake is applied or don't unlock when the pedal is released the problem is probably either sticking disc pads or seized pistons.

Jun 09, 2012 | 1994 Honda Civic

1 Answer

Hear air when i push down the brake pedal


If the pedal gets hard then you either have a vacuum leak from the hose coming off of the brake booster going to the intake manifold or the brake booster itself is faulty.

Jan 10, 2012 | 1994 Jeep Cherokee Country

1 Answer

No braking assist, rushing sound (air escaping)wheng brake pedal applied.


HI this sounds like the vacuum booster has a leak in the diaphragm. That is why you hear that sound when you push on the brake pedal. With out the vacuum to help this leaves you with a very stiff brake pedal. You will need to replace the Booster which is located behind the brake master cylinder and on the firewall. Good luck

Sep 07, 2010 | 1995 Volvo 960

3 Answers

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

Anti lock stuck on is the sensor known to fail brakes soled and sounds like air presure being released at brake pedal


Frist is your pedal hard to push? Like stepping on a rock. If so, and your hearing air at the pedal, then your master cylinder is faulty and must be replaced. Hope this helps.

Jun 05, 2010 | 1993 Lincoln Town Car

1 Answer

Hesitation in acceleration on my 92 audi 80 quatto


Run the car fo a while. Turn it off and wait about 30 seconds. Pull the hose off the booster. You will hear a loud rush of air entering the booster to fill the void. If not the booster is leaking. It will also cause all sorts of idle and off-idle acceleration problems. Did you check the hose from the engine to the booster? Was there a chack valve in the line too?

Feb 06, 2010 | 1992 Audi 80

2 Answers

I have a 1998 chevy s10 it has a good brake pedal with the engine off but with it running the pedal go'es to the floor and you can hear air at brake booster


Check for fluid leaks and your brakes. If you see no leaks and your brakes are in good shape replace the brake master cylinder and bleed the system. The air you hear is because the pedal went to the floor. If the booster goes bad the pedal will get so hard you can hardly push it at all. I think you will find if this happened suddenly either you have a major leak or the master cylinder went bad.

Sep 29, 2009 | 1998 Chevrolet S-10 Pickup

3 Answers

Hard brake pedal hear air leaking when pedal pushed


When you press on the brake? Have your brake vacuum assist checked. It,s that bigspaceship looking thing between the brake master cylinder an firewall. good luck and be safe.

May 25, 2009 | 1999 Chevrolet Tahoe

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