1974-1986 Jeep CJ Chrome Master Cylinder, Black 7" Booster and Proportioning Valve. Master cylinder is a chrome Corvette style and is designed for use with disc/disc or disc/drum brakes. Booster is black 7 inch dual diaphragm which offers better stopping than single diaphragm boosters. Kit also includes chrome proportioning valve with mounting bracket and stainless brake lines. Upgrade smooth and ball-milled master cylinders available. This complete kit is designed to bolt up to 74-86 CJ Jeeps.