8-Inch Chrome Dual Power Brake Booster with 1-1/8 Inch Bore Flat Top Master Cylinder and Side Mount Valve for Disc/Drum for 1955-1968 Chevrolet

Upgrade your classic Chevrolet with LEED Brakes' 8" chrome Dual Diaphragm power brake booster, 1-1/8" bore flat top master cylinder, and side-mount proportioning valve for disc/drum applications. This premium 8" booster is hand-polished before receiving a durable chrome finish, delivering both show-quality appearance and long-term performance.

Designed to mount directly to your factory firewall, this kit provides a clean, direct-fit installation and an excellent upgrade from manual brakes. Included is a chrome 1-1/8" bore flat top aluminum master cylinder and proportioning valve engineered specifically for front disc/rear drum brake setups, improving braking balance and pedal feel.

1955-1968 Chevrolet 8" chrome Dual Diaphragm Power Brake Booster Kit – Disc/Drum Specifications

• Master Cylinder Bore Size: 1-1/8 in.


• Bowl Design: Dual Bowl


• Master Cylinder Material: Aluminum


• Master Cylinder Finish: Polished


• Reservoir Included: Yes


• Reservoir Material: Aluminum


• Master Cylinder Cap Included: Yes


• Brake Booster Type: Dual Diaphragm


• Brake Booster Diameter: 8 in.


• Brake Booster Material: Steel


• Brake Booster Finish: Chrome


• Brake Pedal Rod Extension Included: Yes


• Mounting Hardware Included: Uses Original


• Quantity: Kit

This LEED Brakes kit enhances braking performance while maintaining a clean, factory-style under-hood appearance.

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.