Wilwood Black Dynapro Four-Piston Front Hub System for GM Second-Generation AFX ProSpindles, Separate 11.75-Inch Plain Rotor Rings (Listed 1970–1990 Applications)

This second-generation AFX front package supplies black Dynapro radial calipers, 11.75-inch plain rotors and separate aluminum hubs. BP-10 pads and rotor adapters complete the specified service-brake arrangement. It is conditional on the documented Wilwood second-generation AFX ProSpindle, with a different application set from the earlier spindle kit. Verify that the wheel seats completely on the hub face and passes the clearance drawing. Wilwood Engineering, founded by Bill Wood in 1977, designs and manufactures disc brake systems from its Camarillo, California base. Motorsport, street-performance and specialized applications use its calipers, rotors, master cylinders, valves, fittings and brake lines. Correct component selection depends on the requirements of the entire braking system.

Technical Details

• Manufacturer part number: 140-15981. Quantity: one kit for the stated axle/application.
• Rotor specification: 11.75-inch outside diameter × 0.81-inch thickness; plain faces. Iron construction; Ultralite HP 30 design; published vane configuration: 32 V.
• 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.
• 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.
• Mounting hardware and the specified pads are included. Spindles, master cylinder and brake booster are not supplied.
• Brake hoses are not included. Manufacturer line-kit reference(s), sold separately: 220-10509.

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.

Ask PMB Performance to review the brake configuration if the vehicle has been modified. Our 20+ years of parts and fitment experience help identify the axle, spindle and wheel details that need to match before the kit is selected.

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.