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I have recently replaced the master cylinder and power steering pump on my 37' 1993 bounder with a p30 454ci, all disc brakes.The hydro booster system seems to be working fine and the brakes feel firm. I drove it for the first time since the repair and after about 1.5 miles the brakes applied by themselves and I came to a full stop. When I opened the bleeder valve on the passenger side caliper It released the brakes and I could return home. I've replace the brake lines and it still continues to happen. What could be causing this lockup, it feels like the auto engage.
I have not worked on a P30 with tour brake system but.... It sounds like the master cylinder is not releasing the fluid. The brake rotors warm up and grow slightly and so on. On the older ones the push rod from the brake peddle to the booster or from the booster to the master was what caused these problems. This will sound weird but next time it locks up crawl under the dash and disconect the brake peddle momentarily. Or check the adjustment if it has one. Good Luck
I agree with what has been said so far. The relief ports in the master cylinder are covered. You don,t have enough brake pedal free play. Adjust the linkage between the pedal and the master cylinder to specs. That should fix the problem.
I was moving my 1993 winnebago Brave today to a new storage place and all of sudden the brakes started to lock up and time I got off the road smoke was coming out the engine cowling. It is on Chevy p30. How do I unlock them?. It is sitting i a vacant lot now. It hadn't hardly been moved in 2 years.
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