Wilwood Black Dynapro 4-Piston Front Brake Conversion with 11.75-Inch SRP Rotors, Listed GM Vehicles with AFX ProSpindles (Listed 1964–1974 Applications)

This Dynapro front conversion uses drilled/slotted 11.75-inch rotors, black four-piston radial calipers and separate aluminum hubs. Its rotor adapters locate the rings on the supplied hub arrangement for Wilwood AFX ProSpindles. The kit does not fit an original spindle simply because the vehicle appears in the application table. Plan compatible flexlines separately and verify the wheel mounting surface as well as the barrel clearance. Based in Camarillo, California, Wilwood Engineering was founded by Bill Wood in 1977. Its disc brake systems serve motorsport, street-performance and specialized applications. The range includes calipers, rotors, master cylinders, valves, fittings and brake lines, with each component chosen for its role in the complete brake installation.

Technical Details

• Manufacturer part number: 140-15909-D. Quantity: one kit for the stated axle/application.
• Brake hoses are not included. Manufacturer line-kit reference(s), sold separately: 220-7056.
• Service caliper: Dynapro Radial Mount; 4 pistons; stainless piston material. Radial mounting, black powder coat finish.
• Published piston bores: 1.75, 1.75 inches. Supplied pad compound: BP-10.
• Caliper hydraulic inlet: 1/8-27 NPT.
• Rotor specification: 11.75-inch outside diameter × 0.81-inch thickness; SRP drilled & slotted faces. Iron construction; SRP Drilled Rotor design; published vane configuration: 32 V.
• Supplied hub assembly: Hub - Vented Rotor Offset, aluminum, bare finish.
• Wheel mounting patterns: 5 x 4.50; 5 x 4.75 inches.
• Mounting hardware and the specified pads are included. Spindles, master cylinder and brake booster are not supplied.
• Minimum nominal wheel diameter: 15 inches. The wheel must also clear the actual caliper and rotor profile in the installation drawing.

Fitment & Compatibility

Use only with the documented Wilwood AFX ProSpindles on the listed GM A-, F- and X-body applications. The manufacturer identifies the primary groups as 1964–1972 A-body, 1967–1969 F-body and 1968–1974 X-body; individual rows retain their specific year and model limits. The required aftermarket spindles are not included, and original spindles are not an equivalent interface. Verify wheel-bolt pattern, hub contact surface, caliper clearance and the completed hydraulic balance. The wheel mounting surfaces must seat fully on the hub; follow the installation sheet’s spacer requirement if a wheel contact surface overhangs the hub face. Use the complete application table below for the individual year, submodel, brake configuration and note attached to each entry.

With over 20 years of parts and fitment experience, PMB Performance can help compare the required mounting interface with the vehicle build. Share spindle or axle measurements and wheel information before ordering if anything is uncertain.

Manufacturer documentation: Installation instructions.

Manufacturer Warning

Applicable to brake pads only: Wilwood warns of exposure to arsenic, cadmium, hexavalent chromium compounds, lead, nickel, cobalt and antimony trioxide, chemicals known to California to cause cancer or reproductive harm. More information: P65Warnings.ca.gov.