Question about Plumbing
The brakes on our 1987 GMC dump truck are engaging by themselves when they get hot. After about an hour, they disengage and you can run the truck again. We have replaced the master cylinder and booster. We have bled the master cylinder per the instructions and also each brake line as instructed. The brake pedal seems to be working fine (not spongy). The brakes just get hot and engage without pushing the brake pedal.
It sounds like you have a broken spring in the hub, letting the brake shoes drag.
Posted on Oct 12, 2009
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Posted on Jan 02, 2017
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