Wilwood 12.88-Inch GT Rear Brake Conversion with Red Superlite and EPB Calipers, New-Style Big Ford Axles at 2.36-Inch Offset

GT-slotted 12.88-inch rings and red Superlite 4R calipers form the service-brake portion of this rear kit. The included EPB hardware adds parking hold without cables, while separate aluminum hats locate the rotors on a correctly matched Ford axle. Based in Camarillo, California, Wilwood Engineering was founded by Bill Wood in 1977. Wilwood designs and manufactures disc brake systems for motorsport, specialized vehicles and street-performance applications. Calipers, brake rotors, master cylinders, valves, fittings and brake lines must be selected in relation to the other components in the finished brake system.

Technical Details

• Manufacturer part number: 140-16131-R; supplied as one rear axle brake kit.
• Hydraulic installation: Hydraulic lines and fittings are separate and must be selected for the vehicle; master cylinder not included; brake booster not included.
• Mechanical contents: Separate wheel hubs are not included; mounting hardware supplied; spindles not included.
• Rotor mounting hats: Aluminum; Black E-Coat; hat offset 1.625 inches. This is a hat dimension, not the axle offset.
• Supplied service pads: BP-10 compound; verify suitability for the intended operating conditions.
• Parking-brake package: Two separate electric parking calipers, control unit, switch with pigtail and universal wiring harness included; vehicle electrical connections require installation.
• Minimum nominal wheel diameter: 17 in; 431.8 mm; full spoke/barrel clearance must be checked using the installation drawing.
• Rotor material and surface: Spec-37 Iron; vented; GT Slotted; surface finish Black Electro Coat.
• Rotor dimensions: 12.88 in; 327.15 mm outside diameter; 1.10 in; 27.94 mm thick.
• Cataloged rotor/hat mounting-hole pattern: 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm; 5 x 5 in; 5 x 127 mm bolt circle; cataloged stud-hole clearances 0.520 in; 13.21 mm. The existing hub or axle flange determines the vehicle wheel pattern and stud specification. These rotor/hat drillings do not convert that pattern.
• Rear axle interface: Big Ford New Style housing flange; 2.36 in; 59.94 mm axle offset. Measure the installed assembly.
• Caliper finish and port: Red Powder Coat; hydraulic inlet 1/8-27 NPT.
• Hydraulic service calipers: Forged Narrow Superlite 4R; 4 pistons per caliper; Forged Aluminium body; radial mounting; Stainless pistons.

Fitment & Compatibility

This kit is selected for Big Ford New Style geometry at 2.36 inches of axle offset. Wheel-stud pattern and register dimensions must match the supplied rotors or hats, and the parking motors and harness connectors need clearance throughout suspension travel. Compare the intended 17-inch or larger wheel with the installation drawing.

Review the fitment table below after identifying the rear axle. Confirm housing-flange dimensions, retention hardware, offset, register and wheel pattern against the kit drawing. For a 1990 Lincoln Town Car, identify the actual axle and confirm the specified interface; do not select this conversion from model and year alone.

The supplied EPB switch and pigtail connect through a universal harness to the controller and separate parking-caliper motors. Vehicle-specific power, ground and ignition/accessory wiring still requires installation under DS1353. This static-hold system is independent of the service brakes and is not intended for emergency stopping.

For help checking the installation, contact PMB Performance with the vehicle year and photographs of the existing brakes. Our more than 20 years of parts experience helps identify the details that model names alone cannot settle.

Review the Installation instructions, Technical bulletin, EPB mounting and wiring instructions before selecting hardware or checking wheel clearance.

Manufacturer Warning

Applicable to 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.