67-70 Ford Mustang Chrome Master Cylinder with Chrome 9" Brake Booster and Proportioning Valve. Kit is designed to bolt up with no modifications. Master cylinder is a Corvette style and designed for use with disc/disc or disc/drum brakes. Booster is an 9 inch single diaphragm. Kit also includes proportioning valve which will be your choice of disc/disc or disc/drum. The base kit includes standard chrome master cylinder pictured with booster. Upgraded master cylinders (smooth top or ball-milled) are available. Optional master cylinders are pictured separately. Kit comes with chrome brackets, proportioning valve bracket and chrome brake lines.