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Brake booster issue

Tiny
FOURSTARCHEF
  • MEMBER
  • 1997 GMC JIMMY
  • 10,854 MILES
Is it possible for a brake booster to fail without any residual fluid leaking
Monday, August 6th, 2012 AT 8:15 PM

6 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
You must be refering to the master cylinder. Brake booster is vacuum operated and does not use any fluids. Yes, master cylinders can fail internally with minimal or no leakages.
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Monday, August 6th, 2012 AT 8:24 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Yes, What is it doing? Try this while engine is off-pump brakes a few times hold in and then start car-did the brake pedal drop inward?
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Monday, August 6th, 2012 AT 8:24 PM
Tiny
FOURSTARCHEF
  • MEMBER
  • 3 POSTS
It's giving the hissing noise when the pedal is depressed. It's like stopping a non PB vehicle. The abs motor, is functioning correctly(it's pushing back on the pedal when brakes are applied)I see no fluid leakage anywhere. Fluid is a bit dirty, but still where it belongs. Valve on the manifold, and booster work fine, no leaks in the vacuum hose. A true quagmire
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Monday, August 6th, 2012 AT 8:44 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The brake booster diagphram has ruptured
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Monday, August 6th, 2012 AT 8:47 PM
Tiny
FOURSTARCHEF
  • MEMBER
  • 3 POSTS
So, that being the case. Why can't I find a rebuild kit for it. If you can buy rebuilt boosters from auto stores, someone has to sell the kits
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Monday, August 6th, 2012 AT 8:50 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You have to replace the brake booster-I don't think it comes with a rebuild kit-
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Monday, August 6th, 2012 AT 10:24 PM

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