Wilwood Rear Superlite 4R Conversion with Black Calipers and 12.88-Inch GT Rotors, Big Ford 2.36-Inch Offset, Electric Parking Brake Included

This Big Ford rear kit uses black radial-mount Superlite service calipers and two-piece 12.88-inch GT rotors. Separate electric parking units add static holding power, with the rotor hats and brackets selected for a 2.36-inch axle offset. Wilwood Engineering was established in 1977 by Bill Wood and is based in Camarillo, California. It designs and manufactures disc brake equipment for specialized applications, motorsport and street-performance use. The product range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines; each is chosen to meet the complete system’s requirements.

Technical Details

• Manufacturer part number: 140-16143; supplied as one rear axle brake kit.
• Supplied service pads: BP-10 compound; verify suitability for the intended operating conditions.
• Rotor dimensions: 12.88 in; 327.15 mm outside diameter; 1.10 in; 27.94 mm thick.
• Minimum nominal wheel diameter: 17 in; 431.8 mm; full spoke/barrel clearance must be checked using the installation drawing.
• Rear axle interface: Big Ford housing flange; 2.36 in; 59.94 mm axle offset. Measure the installed assembly.
• Hydraulic service calipers: Forged Narrow Superlite 4R; 4 pistons per caliper; Forged Aluminium body; radial mounting; Stainless pistons.
• Mechanical contents: Separate wheel hubs are not included; mounting hardware supplied; spindles not included.
• Caliper finish and port: Black Powder Coat; hydraulic inlet 1/8-27 NPT.
• 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.
• Hydraulic installation: Hydraulic lines and fittings are separate and must be selected for the vehicle; master cylinder not included; brake booster not included.
• Rotor material and surface: Spec-37 Iron; vented; GT Slotted; surface finish Black Electro Coat.
• Rotor mounting hats: Aluminum; Black E-Coat; hat offset 1.625 inches. This is a hat dimension, not the axle offset.
• Parking-brake package: Two separate electric parking calipers, control unit, switch with pigtail and universal wiring harness included; vehicle electrical connections require installation.

Fitment & Compatibility

Use only an axle that matches the documented Big Ford flange and 2.36-inch offset. Rear-end names can conceal different bearing flanges, so measure the installed parts. Check the rotor register, studs, axle retention and complete wheel outline rather than relying on the nominal 17-inch wheel size.

Use the fitment table below together with a measured axle check. A model name alone does not establish conversion compatibility; compare the flange, axle offset, register and chosen wheel pattern. 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.

Parking actuation is electric through a supplied controller, switch with pigtail, universal harness and two motor-driven calipers. The installer must provide suitable vehicle power/ground and ignition/accessory connections and check lead routing to DS1353. These additional calipers are for parking hold, not an emergency stop function.

Contact PMB Performance if the installed hardware differs from the documented arrangement. More than 20 years of parts experience informs our fitment review; photographs and measured dimensions are particularly useful.

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.