Question about 2000 Chevrolet Blazer

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When starting ,then pushing on brake it sounds like it's loosing air , then after I use the brake it stop's hissing.. The ABS light goes on sometimes than goes off , same as the brake light.. Brake's have been changed ,front & back , pads & rotors. Brake's seem to work fine.

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If you notice a bit of a hard pedal,i,d have the check valve, and the Brake booster checked it may have a cracked diaphram,causing a vacummn leak.Probably what your hearing. .

Posted on Sep 17, 2010

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Your booster diaphram has torn. replace booster and let us know if you have questions.

Posted on Sep 17, 2010

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Related Questions:

1 Answer

What would cause the Emergency Brake light to not go off when the emergency light is released? What causes the ABS warning light to come on?


When I had that problem with the emergency light it was the sensor for emergency brake
The abs and brakes sounds like you are loosing pressure in the system

Apr 18, 2015 | 2004 Toyota Prius

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What could this be? I need help please


Vacuum leak. Open the hood and try to locate where the hissing sound is coming from. Likely a rotted rubber vacuum hose somewhere.

Jul 22, 2014 | 2005 Mazda Tribute

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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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The brake lights came on with abs brake pedel is very rough and doesnt goes down all the way and took it to repair shop and told us it the turbo booster .


go to some on eles and have them scan it. but i thank your abs pump is bad or its brain. also brake booster can cause the pedal to be hard if it is bad you should be able to hear a hissing sound in side the car when you push the pedal

Feb 05, 2011 | Chevrolet Cavalier Cars & Trucks

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94 s10 chevy 2wd brake pedal fades to floor before stoping


Might check around the big black round muffin shaped chamber adjacent to the master cylinder for a loose vacuum hose or crack therin; the hissing sound seems likely to be the air rushing in as you loose the vacuum that supplies the power to assist your braking effort (power brakes)---as this goes, so goes your peddle until it reaches the actual piston pushing the brake fluid (which should be firm like with non-power brakes).
...maybe have an assistant push on the peddle while you listen with a piece of hose or a stethescope to find the leak (or I suppose the power unit diaphragm could be shot/leaking--hence replacement), but since you said after bumpy road etc, one could hope for a simple dislodged vacuum hose or fixable crack.

Aug 08, 2009 | 1994 Chevrolet S-10

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Abs trac control light goes on at start up then off


It sounds like an ABS sensor or some other sensor going out. IF it's the main computer for the traction/handling system that's big $$$$$ like $1300+ I think.
This problem frequently starts out as occasional, goes to frequent, and then full time.  It usually relates to the ABS/TC assembly on the frame in front of the engine. 
It is made of two parts, the EBTCM (the electronic part) wich is bolted to the mechanical half, the BPMV (Brake pressure modulating valve.) Sometimes the electronic grounds for this assembly get corroded or loose. Bad connectors for the ABS speed sensors at each wheel hub can also go bad.

EBTCM = Electronic Brake Traction Control Module
Good luck and hope this helps.

Apr 09, 2009 | 2000 Chevrolet Corvette

2 Answers

Brake hissing noise


Sounds like it could well be the brake servo unit.

Mar 29, 2009 | 2005 Lincoln Navigator

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When I drive my honda accord 1995 2.2l and I make a stop, the brake pedal starts loosing pressure and goes all the way to the button.or if the car is running I have to push the brake pedal more than 2...


first thing to check is your fluid level. ensure you have enough fluid in your master cylinder. it sounds like you have air in the system. its not really hard to bleed. just get a friend to come over and one of you climb under the car with a bucket and a wrench and some rags. open the bleeder valve on the calipers and have your buddy press the pedal. once oil shoots out straight from the valve close it while its still squirting. if the oil has alot of air in it have your buddy keep pumping to until its not. also make sure you watch your master cylinder level as you are just squirting it all out. do that to all the brakes. as far as it being the master cylinder thats a way later thing. you check the fluid level/air in lines first. as far as the abs. is your abs light on? problem with abs is that it requires specialized work so your best bet is taking it to a shop. but if there isnt air in the lines and there is plenty of fluid then start looking at your brake adjustment. if that is good then possibly the master or slave cylinder

Mar 20, 2009 | 2003 Honda Accord

1 Answer

Bad Brakes


I would be looking at the ABS valve. one way to test the booster is to start the vehicle while you ae depressing the brake pedal, you should feel the brake pedal drop a little bit, this is a sign that the boostr is working properely. you may want to check to see if there is any air in your system as well.
hope that this helps.

Oct 16, 2008 | 1996 Chevrolet K1500

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