Wilwood Black 12.88-Inch GT Front Brake Conversion for Ford/Mercury Mustang/Falcon/Comet/Ranchero/Fairlane/Caliente/Cyclone/Cougar/Montego/Torino (1963–1969), V8 Spindle

This Wilwood front package supplies black six-piston calipers, GT slotted 12.88-inch rotors and replacement hubs for the stated Ford/Mercury V8 spindle applications. Separate hats carry 48-curved-vane Spec-37 rings. The 1965–1967 Mustang arrangement accepts the specified disc or drum spindle, while 1968–1969 Mustang fit is limited to the drum spindle; compare other listed models individually. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings, and brake lines for motorsport, street-performance, and specialized applications.

Technical Details

• Manufacturer part number: 140-12637
• Type: Forged Narrow Superlite 6R Big Brake Front Brake Kit (Hub)
• Calipers: Forged Narrow Superlite 6R; 6 pistons per caliper; Black Powder Coat.
• Caliper bore sizes: 1.62, 1.12, 1.12 inches. Piston type: Stainless.
• Included pad compound: BP-10.
• Rotors: 12.88-inch diameter × 1.10-inch thickness; GT Slotted; Spec-37 Iron; Black Electro Coat surface; 48 curved vanes.
• Wheel mounting change from OE: +.25 inches per side.
• Replacement hubs: Hub - Hat Mount; Aluminum; Bare.
• Wheel bolt circles: 5 x 4.50; 5 x 4.75 inches.
• Included: paired calipers, pads, rotors, mounting brackets and assembly hardware, replacement hubs, rotor hats.
• Hydraulic lines and fittings selected separately. No master cylinder, booster or spindles are supplied.
• Conditional wheel screening size: 17 inches. Use the installation clearance diagram to verify the actual barrel and spoke profile.

Fitment & Compatibility

Use DS928 to identify the original V8 spindle before ordering. Check the exact year and brake configuration rather than relying on the Mustang family name. The hub shifts each wheel outward 0.25 inches, so assess tire position as well as the 17-inch screening envelope. Hydraulic hoses are separate and may vary by production year. Confirm master-cylinder/pushrod suitability and rear brake balance for the converted vehicle.

Match the individual model, year, submodel and brake configuration in the fitment table below.

Wilwood installation documents: Installation instructions.

PMB Performance has over 20 years of brake-system experience. Contact us with your vehicle details and installed brake hardware for help confirming the correct arrangement.

California Proposition 65 warning, brake pads only: WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.