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Brakes locking up for no reason
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Question
sahls01gmc
I have an 01 GMC Sierra 2500 (non HD) with 232,000 miles. I've been having problems with the brakes lately. Recently, the brakes would not release after you let off the pedal, and continually got worse until you could not physically move the truck. After about 3 to 4 hours, everything had "cooled off" enough and the truck would drive as normal. I took it to a shop, and they said that the front calipers were done, and needed to be replaced. I replaced them, and had the system flushed. The same thing has just happened this morning. I had been driving on the highway for 15 miles, and I didn't even touch the brakes. Gradually, I could feel the truck slowing down unless I gave it more gas. By the time I got off the highway and parked off the road, the rear brakes were smoking. And the brake pedal was as hard as a rock. I could smell the front brakes as well, but they were not smoking.
The 2 Brake lights that are on the dash have lit up from time to time, but i have not been able to check the codes, and they only sporadically come on.
What problems should I be expecting? I have recently replaced both wheel bearings, so I think I can rule those out at this point.
Thanks in advance for any help that you can offer.
James
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Doug_Scott
I agree that it is likely in the master cylinder system. By that I mean it is likely somewhere between the rubber on the brake pedal and the brake lines that attach to the master cylinder. Could eve
jamiecd77
I have had the same problem, and after 3 months of trying to figure it out,we finally disconnected the master cylinder from the brake booster. The front brakes that we're locking up instantly released
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