1970 Chevrolet Impala, Pontiac Catalina, Oldsmobile 88, Buick Electra Factory Disc Brake Hold Off Valve 1pc This kit includes the valve, bracket, and mounting bolt. This mounts on the master cylinder stud for disc cars. For the first time available 70 GM Disc Brake Hold Off Valve. This is the valve that is needed to make your car factory disc brakes. The valve is mounted off the stud of the master cylinder and holds off pressure so the rear drums will kick on a second before the front disc's. The fluid builds up pressure and once it by passes the spring in the valve it applies pressure to the front brakes. If you are making or have a factory disc brake car this valve will make your car correct.
