8-Inch Dual Power Brake Booster with 1-1/8-Inch Bore Zinc Master Cylinder for GM AFX

Elevate your vehicle’s braking system with the LEED Brakes 8-Inch Dual Diaphragm Zinc-Plated Power Brake Booster & Master Cylinder Kit. This premium kit features an 8" power booster that is meticulously hand-polished before receiving a durable yellow zinc finish, delivering long-lasting corrosion resistance and a high-quality appearance.

Designed for direct mounting to your factory firewall, this power brake booster ensures straightforward installation while maintaining a clean, OEM-style look. Included is a new 1-1/8" bore master cylinder compatible with both disc/drum and disc/disc brake systems, making this kit a versatile solution for performance upgrades or restoration projects.

Ideal for a wide range of GM AFX models from 1964–1974, including the Chevrolet Nova, Oldsmobile Omega, Buick Apollo, and similar platforms, this kit provides improved braking responsiveness, safety, and reliability.

The GM AFX 8-inch dual diaphragm brake booster kit from LEED Brakes delivers a significant braking upgrade while preserving classic styling.

GM AFX 8-Inch Dual Diaphragm Power Brake Booster Kit Highlights

• 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 (in): 8 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 how to quickly test your measuring tool for accuracy.

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