7-Inch Zinc Dual Power Booster with 1-1/8 Inch Bore Master Cylinder and Adjustable Proportioning Valve for 1955-1968 Chevrolet

Elevate your Chevrolet's braking system with LEED Brakes' 7" Dual Diaphragm Zinc Plated Power Brake Booster, Master Cylinder, and Adjustable Proportioning Valve Combo. Meticulously hand-polished before receiving a durable yellow zinc finish, this kit is designed to mount directly to your factory firewall for a seamless installation and clean under-hood appearance.

Included in this Chevy power brake booster kit is a new 1-1/8" bore cast iron master cylinder and adjustable proportioning valve, compatible with both front disc/rear drum and 4-wheel disc brake applications. Each component is precision-machined and engineered to enhance braking safety, reliability, and overall performance.

Compatible with a wide range of 1955–1968 Chevrolet models including the 150, 210, Bel Air, Nomad, Del Ray, Biscayne, Caprice, and Impala, this 7-inch dual diaphragm booster kit is ideal for restorations and performance upgrades alike.

1955–1968 Chevy 7" Dual Diaphragm Power Brake Booster Kit Specifications

• 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: 7 in.


• Brake Booster Material: Steel


• Brake Booster Finish: Zinc


• Brake Pedal Rod Extension Included: Yes


• Mounting Hardware Included: Uses Original


• Quantity: Kit

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 verify measuring tool accuracy.

Click here to learn more about why LEED Brakes has added this warning to their products.