Power Front Disc Brake Kit Drilled and Slotted Rotors, Black Powder Coated Calipers with 9" Chrome Booster, Chrome M/C Adjustable Proportioning Valve for GM AFX

Upgrade Your 1964–1974 GM AFX with a Power Front Disc Brake Conversion

Upgrade your 1964–1974 GM A, F, and X body vehicle with a complete power front drum-to-disc brake conversion from LEED Brakes. Designed for classic Chevrolet Camaro, Chevelle, and Nova models, as well as Pontiac GTO and Firebird, Oldsmobile Cutlass and 442, and Buick Skylark and GS platforms, this system delivers modern braking performance with factory-style fitment.

This kit includes black powder-coated single-piston calipers, 11-inch MaxGrip XDS cross-drilled and slotted zinc-plated rotors, a 7-inch dual diaphragm power booster, and a matching master cylinder. The drilled and slotted rotor design helps reduce brake fade by evacuating heat and gases during aggressive braking, improving pad-to-rotor contact and delivering stronger, more consistent stopping power.

GM AFX Power Front Disc Brake Kit Features

• Rotor Included: MaxGrip XDS Cross Drilled and Slotted


• Rotor Construction: Cast Iron


• Rotor Diameter: 11 in


• Rotor Thickness: 1 in


• Caliper: Cast Iron, Single Piston, Black Powder Coated


• Spindles: Designed to fit stock drum brake spindles


• Master Cylinder Included: Yes


• Brake Booster Included: Yes (7-Inch Dual Diaphragm)


• Brake Lines Included: No


• Minimum Recommended Wheel Diameter: 14x7

Performance Benefits

• Improves stopping distance and pedal feel


• Reduces brake fade under repeated or heavy braking


• Direct bolt-on installation — no cutting or welding required


• Moves wheels outward approximately 5/8" per side

LEED Brakes Pushrod Measuring Tool – Proper Booster Installation

All LEED Brakes booster and master cylinder assemblies are preset before shipping. Proper pushrod depth is critical to prevent brake drag and ensure full brake release. Watch this video to correctly measure pushrod clearance and verify proper booster setup before installation.

Learn why LEED Brakes adds this warning to their products.