Wilwood Five-Lug Front Brake Conversion, Black Superlite Calipers and 13.06-Inch SRP Rotors for GM Truck/SUV Iron ProSpindles (Listed 1963–1987 Applications)

This front conversion pairs black six-piston Superlite service calipers with 13.06-inch drilled/slotted rotor rings and five-lug aluminum hubs. Its BP-10 pad specification belongs to the SRP option. The brackets are for Wilwood one-piece iron Pro Drop spindles, so inspect the existing spindle before choosing the kit. Plan the wheel offset around the documented production-year track change and verify clearance with the 17-inch drawing. 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: 140-15941-D. Quantity: one kit for the stated axle/application.
• Brake hoses are not included. Manufacturer line-kit reference(s), sold separately: 220-7056, 220-11237, 220-12168.
• Service caliper: Forged Narrow Superlite 6R; 6 pistons; stainless piston material. Radial mounting, black powder coat finish.
• Published piston bores: 1.75, 1.25, 1.25 inches. Supplied pad compound: BP-10.
• Caliper hydraulic inlet: 1/8-27 NPT.
• Rotor specification: 13.06-inch outside diameter × 1.25-inch thickness; SRP drilled & slotted faces. Spec-37 Iron construction; SRP Drilled Rotor design; published vane configuration: 48 CV.
• Rotor hats: aluminum, black e-coat finish; Big Brake Hat - Flared Bell. Hat offset: 1.380 inch.
• Supplied hub assembly: Hub - Hat Mount, aluminum, bare finish.
• Wheel mounting patterns: 5 x 4.75; 5 x 5.00 inches.
• Mounting hardware and the specified pads are included. Spindles, master cylinder and brake booster are not supplied.
• Minimum nominal wheel diameter: 17 inches. The wheel must also clear the actual caliper and rotor profile in the installation drawing.

Fitment & Compatibility

These application rows require Wilwood C10 one-piece iron Pro Drop spindles; the kit will not fit original equipment spindles. The listed GM trucks and SUVs span specific 1963–1987 model ranges, so check the exact row and installed spindle. Relative to the original brakes and spindle, Wilwood specifies wheel movement of 0.41 inch outboard for 1963–1970 and 0.06 inch inboard for 1971–1987. Match the five-lug 5 × 4.75 / 5 × 5.00-inch wheel interface and allow for the resulting wheel position when checking fender, suspension and brake clearance. Spindles and flexible lines are not included. 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.