8-Inch Zinc Dual Power Brake Booster with 1-Inch Bore Master Cylinder and 4-Wheel Disc Valve for 1957-1972 Full-Size Ford

Upgrade your 1957–1972 Full-Size Ford with the LEED Brakes 8-Inch Zinc Dual Diaphragm Power Brake Booster Kit featuring a 1-Inch Bore Master Cylinder and 4-Wheel Disc Valve. This premium LEED Brakes power brake booster is hand-polished before receiving a durable yellow zinc finish for corrosion resistance and a clean, factory-style appearance. The included mounting brackets are engineered for a direct bolt-on fit to your factory firewall, ensuring a straightforward installation.

This kit includes a 1-inch bore dual bowl cast iron master cylinder and adjustable proportioning valve, making it ideal for most 4-wheel disc or 4-wheel drum brake applications.

1957–1972 Full-Size Ford 8-Inch Dual Diaphragm Power Brake Booster Kit Key Highlights:

• Master Cylinder Bore Size: 1 inch


• Master Cylinder 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: 8 inches


• Brake Booster Material: Steel


• Brake Booster Finish: Zinc-plated


• Brake Pedal Rod Extension Included: Yes


• Mounting Hardware Included: Uses original


• Quantity: Kit

Note: This kit converts manual brake vehicles to power brakes. If your vehicle is already equipped with factory power brakes, you must use one of LEED Brakes’ Power-to-Power Upgrade Kits.

LEED Brakes Pushrod Measuring Tool PSA Video

All LEED Brakes booster and master cylinder assemblies are preset before shipping. Watch this short video to learn how to properly measure pushrod depth and how to quickly test your measuring tool for accuracy.

Learn more about the California Prop 65 warning included with LEED Brakes products.