1974-1986 Jeep CJ Polished Wilwood Master Cylinder and Chrome 8" Booster. Master cylinder is a polished Wilwood with machined black anodized top and is designed for use with disc/disc or disc/drum brakes. Booster is chrome 8 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. This complete kit is designed to bolt up to 74-86 CJ Jeeps.