66-77 Ford Bronco Black Wilwood Master Cylinder and 7" 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 a black Wilwood with machined black anodized 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 Wilwood adjustable proportioning valve with mounting bracket and stainless brake lines.