Wilwood Rear ProMatrix 12.88-Inch Rotor Conversion for Ford Mustang (2005–2013), SRP

This Wilwood rear ProMatrix package replaces the rotor arrangement on the specified Mustang brake configuration with 12.88-inch drilled/slotted rings and separate hats. Caliper relocation brackets position the retained service calipers for the larger rotor diameter. It is a rotor conversion package rather than a complete rear caliper or parking-brake kit; brake pads and calipers are not supplied. 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: 140-12468-D
• Type: Promatrix Rear Replacement Rotor Kit
• Rotors: 12.88-inch diameter × 0.75-inch thickness; SRP Drilled & Slotted; Iron; Black Electro Coat surface; 48 curved vanes.
• Wheel bolt circles: 5 x 4.50 inches.
• Package: paired replacement rotor rings, aluminum hats and attachment hardware, caliper relocation brackets. Calipers, pads, hydraulic lines and wheel hubs are not included.
• Conditional wheel screening size: 17 inches. Use the installation clearance diagram to verify the actual barrel and spoke profile.

Fitment & Compatibility

Confirm the original Mustang rear brake package and production-year entry before selection. DS898 identifies the rotor, hat and caliper-bracket components and shows how the retained caliper is repositioned. Check wheel clearance and parking-brake operation after the rotor change. Inspect existing pads and calipers for suitability and service condition; a listed model year does not establish compatibility with a previously converted rear axle.

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.