Question about 1996 GMC Sierra
Posted by Anonymous on
this noise is caused by a defective power brake vacuum booster, (big round thing behind the master cylinder) the diaphragm is leaking vacuum.
Posted on May 06, 2009
Hi I'm litoshop if you bled the system and get no results then your brake pump needs to be replaced now before replacing make sure your pads are installed correctly because if there not this to can cause this problem good luck. if this information has been useful please let us know thank you.
Posted on Aug 11, 2009
SOURCE: Brakes problem
jcakey: My name is Roger and I will answer your question for you. From what you describe the problem sounds like a bad vacum brake booster. A simple way to check is to do the following. With the engine off. Press on the brake pedal 4 or 5 times. This will deplete all vacum in the booster. Next start the engine while holding your foot on the brake pedal. The pedal should drop a couple of inches. If the pedal does not drop. The problem is the brake booster. When the booster is bad you will hear a hissing sound inside of the truck when you apply the brakes..
If the master cylinder is faulty you will wave mushy brake to no brakes.Your ABS and brake failure lights will be on. Should you need further help please just ask. I will be glad to help you. Please rate this answer as this is how we know your answer was useful.Thank You for using Fix Ya. Roger
Posted on Sep 09, 2009
check under your master cylinder,is there another clyinder below with one line in and one line out,if you do I found this is for the Abs to the rear,I had to replace this it was full of air,and did exactly what yours is now
Posted on Dec 09, 2009
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