VEHICLE-SPECIFIC CONVERSION: Designed to convert manual brakes to power assist on 1964–1972 GM A, F, and X body vehicles with little to no modification required., DUAL POWER BOOSTER: Features an 8" dual diaphragm power brake booster to provide increased braking assist and improved pedal feel., MASTER CYLINDER INCLUDED: Comes with a 1-1/8" bore cast iron master cylinder with 1/2"-20 and 9/16"-18 outlet ports for disc/disc brake systems., COMPLETE KIT CONTENTS: Includes booster, master cylinder, zinc-plated booster bracket, disc/disc proportioning valve kit, clevis, and pedal rod extension., STRAIGHTFORWARD INSTALLATION: Supplied with detailed instructions to help ensure a smooth, efficient installation on Buick, Chevy, Oldsmobile, and Pontiac platforms.