Proportioning / Combo Valves. 1987-2006 CJ XJ & YJ Cherokee, Grand Cherokee Jeep Proportioning Valve Disc Drum. 1987-2006 JEEP CJ XJ YJ PROPORTIONING VALVE. We specialize in performance brakes for late fullsize GM cars from 1955-70 and muscle cars from 1962-74,, Chevy, & Ford.
