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06-23-2013, 12:06 PM
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#1 |
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Registered User
Join Date: Oct 2011
Location: Michigan City, Indiana
Posts: 158
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Brake Problem
I have a 1986 GMC 2500 with the JB7 Brake Code. Last fall I put new shoes on the rear along with a new brake booster. Just last week my brakes were feeling spongy and going almost to the floor before they would grab. I replaced the master cylinder thinking it was that, Now everyonce in a while if i slam on the brakes the pedal sticks to the floor. and the brakes still go to the floor before they catch. With the truck off, if I pump the brakes up I get a really stiff pedal. I replaced the vacuum line and did not seem to help. Not to sure what to look for now. Maybe the proportioning valve? Let me know Thanks.
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06-23-2013, 01:53 PM
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#2 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: Brake Problem
Do these tests on your brakes.
http://www.73-87.com/7387garage/chas...on/booster.htm I've seen rebuilt master cylinders fail on installation. Once, I had to get a third one to get a good one. |
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