New 8" Dual Diaphragm zinc plated power brake booster, master cylinder and adjustable proportioning valve combo. This 8" power booster is hand polished before a yellow zinc finish is applied for a top quality finish. The top quality power brake booster is designed mount directly to your factory firewall. Also included in this double brake booster kit is a new 1-1/8" bore master cylinder and proportioning valve equipped to work with front disc rear drum or 4 wheel disc applications. Master Cylinder Bore Size: 1-1/8 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: Dual Diaphragm, Brake Booster Diameter (in): 8 Booster Material: Steel, Brake Booster Finish: Zinc, Brake Pedal Rod Extension Included: Yes, Mounting Hardware Included: Uses Original, Quantity: Kit.