PROPORTIONING VALVES ALLOW YOU TO TUNE THE FRONT & REAR BRAKING BALANCE BY PROPORTIONATELY DECREASING THE REAR (OR IN SOME CASES, FRONT) BRAKE LINE PRESSURE
CAN ALSO BE USED TO ADJUST INDIVIDUAL FRONT WHEEL BRAKING
REPLACEMENT PROPORTIONING VALVES FOR MANY 1978 AND NEWER GM VEHICLES WITH DISC FRONT/DRUM REAR BRAKES:
