New 7" zinc plated power brake booster, master cylinder and disc/drum proportioning valve combo. This top quality power brake booster is designed mount directly to your factory firewall. This Mustang 7-inch power booster kit works great as an upgrade from manual to power brakes for vehicles with automatic transmissions. Also included in this kits is a new factory style 1" bore master cylinder and proportioning valve equipped to work with front disc rear drum applications. Master Cylinder Bore Size: 1 in, Bowl Design: Dual Bowl, Master Cylinder Material: Cast Iron, Master Cylinder Finish: Natural, Reservoir Included: Yes, Reservoir Material: Cast Iron, Master Cylinder Cap Included: Yes, Brake Booster Type: Single Diaphragm, Brake Booster Diameter (in): 7 Booster Material: Steel, Brake Booster Finish: zinc, Brake Pedal Rod Extension Included: Yes, Mounting Hardware Included: Uses Original, Quantity: Kit.