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

Upgrade your 1955–1968 Chevrolet full-size model with LEED Brakes' 7" Dual Diaphragm chrome power brake booster, master cylinder, and adjustable proportioning valve combo. This premium kit features a hand-polished 7" chrome booster designed for direct mounting to your factory firewall, delivering a clean installation and improved braking performance.

Included is a chrome 1-1/8" bore flat-top aluminum master cylinder and adjustable proportioning valve engineered for front disc/rear drum or 4-wheel disc brake applications. This complete system enhances pedal feel, braking balance, and overall stopping power while maintaining a classic under-hood appearance.

1955–1968 Chevrolet 7" chrome Dual Diaphragm Booster Kit 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: 7 in.


• Brake Booster Material: Steel


• Brake Booster Finish: Chrome


• Brake Pedal Rod Extension Included: Yes


• Mounting Hardware Included: Uses Original


• Quantity: Kit

Compatible Chevrolet Models (1955–1968)

• 1968: Impala, Caprice, Biscayne, Bel Air


• 1967: Impala, Caprice, Biscayne, Bel Air


• 1966: Impala, Biscayne, Bel Air


• 1965: Impala, Biscayne, Bel Air


• 1964: Impala, Biscayne, Bel Air


• 1963: Impala, Biscayne, Bel Air


• 1962: Impala, Biscayne, Bel Air


• 1961: Parkwood, Nomad, Impala, Brookwood, Biscayne, Bel Air


• 1960: Sedan Delivery, Parkwood, Nomad, Kingswood, Impala, El Camino, Brookwood, Biscayne, Bel Air


• 1959: Sedan Delivery, Parkwood, Nomad, Kingswood, Impala, El Camino, Brookwood, Biscayne, Bel Air


• 1958: Sedan Delivery, Nomad, Impala, Del Ray, Brookwood, Biscayne, Bel Air


• 1957: Two-Ten Series, Sedan Delivery, One-Fifty Series, Nomad, Del Ray, Bel Air, 210, 150


• 1956: Two-Ten Series, Sedan Delivery, One-Fifty Series, Nomad, Del Ray, Bel Air, 210, 150


• 1955: Two-Ten Series, Sedan Delivery, One-Fifty Series, Nomad, Del Ray, Bel Air, 210, 150

This kit is ideal for restorations or performance upgrades, delivering modern braking capability while preserving the classic Chevrolet look.

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 adds this warning to their products.