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10-28-2004, 09:48 AM
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#1 |
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Registered User
Join Date: Dec 2003
Location: Sachse, TX
Posts: 9
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Brake hiss...
Help...
I'm having a little brake trouble on my '87 burb. When I depress the brake pedal, I hear a hiss that sounds like a small vacuum line hissing air. This persists about half the pedal travel and I have no brake power. Then on the bottom half of the travel, the hiss stops (mostly) and I get brakes. There is a place along the travel that I can hold the pedal at and get a constant hiss and no brakes at all.  What is this?-Kris |
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10-28-2004, 11:45 AM
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#2 |
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Who's in CHARGE??????????
Join Date: Nov 2002
Location: Cahokia, IL
Posts: 455
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i would bet its your brake booster
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Send a card to a soldier in Iraq My Music PlayList Large Marge Donate Blood,Plasma,Platelets & sign your DONORS CARD & SAVE a LIFE |
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10-28-2004, 05:37 PM
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#3 |
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Magnificent bastard
Join Date: Oct 2004
Location: Glendale, AZ
Posts: 196
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It is your brake booster. I had the exact same problem, put in another one with a 12-month warranty, and 13 months later it did it again @#$%*^%$. I was so excited... If its the first time you've changed it, you have my sympathies.
Also, if your master cylinder is leaking into the booster, that will kill it.
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1977 Big Block Burb Last edited by Bad Karma; 10-28-2004 at 05:41 PM. |
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10-29-2004, 08:40 AM
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#4 |
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Registered User
Join Date: Oct 2003
Location: houston, texas
Posts: 1,974
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Yes, its the booster, or the little plastic piece that the hose connects too.....pretty common for the to crack with heat/age and they arent very expensive....check that and the hose for leaks first (it may be dry-rotted).
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2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB |
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10-29-2004, 09:21 AM
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#5 |
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Registered User
Join Date: Dec 2003
Location: Sachse, TX
Posts: 9
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Thanks...
Thanks for the info y'all. Is this piece inside or outside the firewall... I've never replaced one, but I have replaced my master cylender 3 times
 -K |
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10-29-2004, 10:58 AM
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#6 |
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Magnificent bastard
Join Date: Oct 2004
Location: Glendale, AZ
Posts: 196
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The plastic piece is a check valve that is located on the booster in the engine compartment. It has a hose that runs to a vacuum source (mine goes to the carb).
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1977 Big Block Burb |
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11-01-2004, 09:16 AM
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#7 |
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Registered User
Join Date: Oct 2003
Location: houston, texas
Posts: 1,974
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well.................did you fix it?
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2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB |
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11-01-2004, 11:36 AM
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#8 |
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Registered User
Join Date: Dec 2003
Location: Sachse, TX
Posts: 9
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Not yet... I'm a big Halloween guy and was working some Haunted Houses. I'll take a look this coming weekend and keep ya posted.
Thanks, -Kris |
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