Question about 1998 Chevrolet Blazer

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Brakes it makes a noise like if it have air in it, and the vehicle wont stop,you press the break pedal and it trys to shotdown

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  • Master
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Sounds like your power brake booster assembly is leaking...its attached to the master brake cylinder and you will see a hose going to it. Check the hose and make sure it on tight and isn't cracked. if the booster is bad it will have to be replaced. you could also have a master cylinder going bad...check for leaks and proper fluid levels.

Posted on Oct 03, 2009

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  • Master
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Your Brake Booster has a hole in it's diaphragm. The brake booster is the large round object behind the Brake Master Cylinder, located on the firewall.

This is an example to identify your Brake Booster. It is not a recommendation to buy from this website, nor the parts manufacturer,

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Posted on Oct 03, 2009

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  • Chevrolet Expert
  • 332 Answers

This sounds like the brake booster has a vacuum leak or it`s just a bad brake booster first try bleeding the brakes and checking the adjustments on the brakes mainly the back brakes if you have drums. The drums should barely slide over the brake shoes meaning the drum should be barely fitting over the brake shoes as it goes over the shoes. If it doesn`t then you need to turn the little cog to widen the shoes and when bleeding brakes start with rear passenger side then go to rear driveres side then front passenger side then driveres side front hope all this info helped you.

Posted on Oct 03, 2009

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  • Chevrolet Master
  • 2,050 Answers

Your brake booster works off of engine vacuum. It's located behind the brake master cylinder. It may be the issue from what you describe.

Posted on Oct 03, 2009

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2 Answers

How do you know that a brake booster is bad?


Booster problems are rare but they do go bad sometimes.
A bad booster generally causes the brake pedal to feel hard to push down, and a lot of pressure on the brake pedal is required to make the car stop.
Rarely, a vacuum brake booster will develop a vacuum leak, which can cause engine performance problems, hissing or whistling noise, as well as requiring increased pressure on the brake pedal to stop.

The first test:
With the vehicle parked, turned OFF, and the parking brake set, pump the brake pedal 5 to 6 times. If the pedal gets harder to push after several times, your booster is probably good.

The second test (To make sure):
After the test above, without making any changes, press and hold the brake pedal with light to moderate pressure.
Now with your foot still on the brake pedal, start the vehicle.
If the booster is good, you will feel the pedal go down when the engine starts.

Hope this helps!

Jun 21, 2014 | 1993 Cadillac DeVille

1 Answer

Back brakes wont stop me. and brake pedal makes a air sound on 1996 s10 jimmy


check your booster were the master cylinder is bolted .that large round thing.and the rubber hose going to it as can be leaking air. but check the sliders on your back brakes may be sticking and need taken off and cleaned.

Dec 15, 2013 | Cars & Trucks

2 Answers

Brake pedal drops very low on first press only


It is most likely you have air in the brake fluid. The first press of the pedal compresses the air and the effect lasts for a little while.
Another cause may be warped (bent) rotors, the pads can be pushed back into the calipers by the off center area of the rotor. This means that the pads have to travel further in order to contact the rotors when you press the pedal.

Dec 06, 2013 | BMW Z4 Cars & Trucks

1 Answer

1996 Buick Park Avenue Ultra making a hissing noise when I press Brake Pedal. Have to Press super hard to stop or slow down.


Sounds like a possible air pocket in the braking system. Do you know how the bleed the brakes? They may need to be bled. Also, if you've added brake fluid recently, and didn't put the cap back on, it could create a suction. Another note is to check the cap to the brake fluid reservoir. It's rare, but, it could be bad.

Jul 10, 2013 | Cars & Trucks

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I just replaced brakes,front and rear,on a 1997 jeep grand cherokee. The rear brake calipers had to be replaced and the parking brakes were shot so I did not reinstall. I bled brakes all around and have a...


Sound like you either have air in the system or a leak. Make sure all the connections are tight on the new calipers. clean off all the connections and blessed screws with brake cleaner. Then have your partner press on the brake pedal while you look for leaks. Reblead the entire system again starting at the right rear, than the left rear, than the right front, and finally the left front. Continue bleeding at each wheel until no air comes out. make sure you don,t let the master cylinder go dry. It will take several pedal pumps for the caliper pistons to take up the gap in between the pads and rotors. I assume you have a helper pushing on the brake pedal during the bedding process?

May 30, 2011 | 1997 Jeep Grand Cherokee

2 Answers

Brakes dont work


u need brake booster

Nov 01, 2009 | 1997 Volvo 960

1 Answer

Our S80 Vovlo, as the vehicle is ruuning, I hear a air leakcoming from the brake patel area, as I touch the patel the noises stop and as I let out the brake patel, the air leake strat again, have any


it sounds like the vacuum pipe to the break servo is leaking or it could be the servo diaphragm broken hence you hear the noise in the car, if the brakes are harder to press its most likely to be the servo unit more than the pipe i would also expect you to having a ideling problem due to the extra air in the intake system. hope this helps regards John

May 15, 2009 | 2001 Volvo S80

2 Answers

Air escaping


this noise is a vacuum leak at the power brake vacuum booster due to a tear in the booster vacuum diaphragm, u should have this replaced ASAP, it the leak gets worse the brakes will become very hard to push and will limit your ability to make a safe and timely stop.

Jan 30, 2009 | 2004 Volkswagen Golf

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