#32096, "RE: ***While Driving, car just starts to shake and then slows down by itself***" In response to In response to 11
A caliper is either bad and the piston is not depressing properly or the caliper slides are corroded and not allowing the caliper to move back and forth. This is neccesary since we have floating calipers. Only other thing i could think of besides this or what others have said is the porportioning valve and I rarely hear of them going bad.