Wilwood Front Brake Kit with Red Dynapro Calipers, 11.75-Inch Drilled/Slotted Rotors and Hubs for GM Second-Generation AFX ProSpindles (Listed 1970–1990 Applications)

Red Dynapro radial calipers clamp 11.75-inch SRP rotors in this later AFX front hub package. The supplied aluminum hubs, adapters and BP-10 pads are for the documented second-generation Wilwood ProSpindle interface. Original spindles or the earlier AFX generation are not interchangeable by assumption. Inspect the wheel's full mounting face, verify its inside clearance and select compatible flexible lines separately. Founded by Bill Wood in 1977 and based in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. Its calipers, brake rotors, master cylinders, valves, fittings and brake lines are selected to suit the complete braking system.

Technical Details

• Manufacturer part number: 140-15981-DR. Quantity: one kit for the stated axle/application.
• Supplied hub assembly: Hub - Vented Rotor Offset, aluminum, bare finish.
• Wheel mounting patterns: 5 x 4.50; 5 x 4.75 inches.
• Minimum nominal wheel diameter: 15 inches. The wheel must also clear the actual caliper and rotor profile in the installation drawing.
• 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.
• Service caliper: Dynapro Radial Mount; 4 pistons; stainless piston material. Radial mounting, red powder coat finish.
• Published piston bores: 1.75, 1.75 inches. Supplied pad compound: BP-10.
• Caliper hydraulic inlet: 1/8-27 NPT.
• Brake hoses are not included. Manufacturer line-kit reference(s), sold separately: 220-10509.
• Mounting hardware and the specified pads are included. Spindles, master cylinder and brake booster are not supplied.

Fitment & Compatibility

Use this kit on the listed GM applications equipped with Wilwood second-generation AFX ProSpindles. Do not assume that original spindles or the earlier AFX spindle are interchangeable. Match the model, production year and spindle option in the application table, then verify the installed spindle, hub bolt circle, full wheel seating and actual spoke/barrel clearance. Match the front caliper volume and pad compound to the master cylinder and rear brakes, and supply suitable braided flexlines separately. If any wheel contact surface overhangs the hub face, follow the documented requirement for the separate wheel spacer rather than allowing an unsupported wheel contact area. Use the complete application table below for the individual year, submodel, brake configuration and note attached to each entry.

PMB Performance has over 20 years of experience working with parts and fitment details. Provide the actual brake hardware, mounting dimensions and wheel measurements when requesting help with this conversion.

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.