Billruston Posted December 7, 2014 Share Posted December 7, 2014 hi all, sorted every thing with my gmc had the hydrovac rebuilt, etc. bled the breraks up a few days ago, went to pull her out and they was jamming on like a good'en, obviously thought it was the breaks, but once I turned the engine of she rolls freely, and once shes running again the breaks all seize up again, any one had these problams, ant advice?. Quote Link to comment Share on other sites More sharing options...
Gordon_M Posted December 7, 2014 Share Posted December 7, 2014 I'll bet with the engine running you have zero free play at the pedal. You need 1" free play there, and even then you can't be sure the piston in the master cylinder is coming right back past the return port. Effectively the engine is powering up the brakes because it thinks you have depressed the pedal. Quote Link to comment Share on other sites More sharing options...
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