My truck has rear brake issues,when i hit the brake the abs and brake warning lamps on dash come on,when they do my right rear brake starts dragging an sometimes locks almost up ive replaced the shoes all hardware an the wheel cylinder,that didnt help.however most of the time an can shut off the engine an restart it the lights and the brakes go back to normal untill the lights come back on.It doesnt do it all the time an a couple times it has locked up untill i released bleeder an hit the drum w a hammer any ideas at all whats goig on? I need my truck i use it daily for my work an got babys to feed