studeystudebaker

[studeystudebaker]

I have a 78 chevy one ton chasis,rear brakes have been converted to disc---recently the rear locked up,they would release if engine not running,they have the e brake calipers-so I disconnected the e cable ,no difference---so I drove it a few miles with the brakes dragging only the rear,they releasted after setting,next morning I pushed the the little pin in proportional valve-they work ok now ,but not sure what caused it,could it have been that valve--??? don't want this to happen again-- I have been driving it for 6 months--thanks. cab is a 48 load master 5 window,frame 78 one ton-engine 4bt cummins----