66-77 Ford Bronco Aluminum Master Cylinder and 7" Black Booster. This complete kit is designed to bolt up without modifying your Bronco and to allow clearance when used with low profile hoods. Master cylinder is an aluminum Corvette style with chrome top 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 proportioning valve with mounting bracket and stainless brake lines.