8-Inch Chrome Dual Power Brake Booster with 1-1/8-Inch Bore Master Cylinder with Chrome Lid and Adjustable Valve for GM AFX

Upgrade your GM AFX vehicle with this 8" Dual Diaphragm chrome-plated power brake booster kit from LEED Brakes. This complete system includes a 1-1/8" bore master cylinder and adjustable proportioning valve engineered for 4-wheel disc brake applications. The 8" booster is hand-polished before receiving a durable chrome-plated finish for a clean, high-quality under-hood appearance. Designed to mount directly to the factory firewall, this kit provides a straightforward installation with proper pedal geometry.

The included cast iron master cylinder features a 1-1/8" bore and dual reservoir design to deliver consistent hydraulic volume and balanced braking performance for 4-wheel disc systems. The adjustable proportioning valve allows fine-tuning of rear brake pressure for proper front-to-rear bias.

Designed for GM AFX vehicles from 1964–1974 including Camaro, Chevelle, Nova, Oldsmobile Omega, Buick Apollo, Pontiac Ventura, and related platforms.

Compatible GM AFX Models

• 1964–1967 Buick Special
• 1964–1967 Chevrolet Malibu
• 1964 Oldsmobile Cutlass / 442
• 1964–1972 Oldsmobile Vista Cruiser
• 1964–1970 Oldsmobile F85
• 1964–1970 Pontiac Tempest / GTO
• 1964–1972 Pontiac LeMans
• 1966–1972 Pontiac Grand Prix
• 1967–1969 Pontiac Firebird
• 1967–1969 Chevrolet Camaro
• 1964–1972 Chevrolet Chevelle
• 1968–1972 Buick GS / Skylark / Sportwagon
• 1968–1972 Chevrolet Nova
• 1969–1972 Chevrolet El Camino
• 1970–1972 Chevrolet Monte Carlo
• 1968–1972 Oldsmobile Cutlass / Cutlass Supreme
• 1970–1972 Oldsmobile Custom Cruiser
• 1968–1971 Oldsmobile Toronado
• 1971–1972 Pontiac Ventura
• 1973–1974 Buick Apollo

1964–1974 GM AFX 8" Dual Diaphragm Chrome Power Brake Booster Kit – 4-Wheel Disc Specifications

• Brake Application: 4-wheel disc
• Master Cylinder Bore Size: 1-1/8 inch
• Master Cylinder Design: Dual bowl
• Master Cylinder Material: Cast iron
• Master Cylinder Finish: Natural
• Reservoir Included: Yes, cast iron
• Master Cylinder Cap Included: Yes
• Brake Booster Type: Dual diaphragm
• Brake Booster Diameter: 8 inches
• Brake Booster Material: Steel
• Brake Booster Finish: Chrome-plated
• Brake Pedal Rod Extension Included: Yes
• Mounting Hardware: 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 how to quickly test your measuring tool for accuracy.

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