Wilwood Black Superlite 4R Rear Service-Brake and EPB System, 12.88-Inch GT Rotors for New-Style Big Ford Housing Ends at 2.50-Inch Offset

This black-caliper Superlite 4R rear assembly uses two-piece 12.88-inch GT slotted rotors and a distinct electronic parking brake. Four-piston service calipers mount radially, and BP-10 pads are specified. The package is intended to match a Big Ford new-style rear axle with 2.50-inch offset. Check service-caliper and EPB-motor clearance separately, since they occupy different areas behind the wheel. Wilwood Engineering, founded by Bill Wood in 1977, designs and manufactures disc brake systems from its Camarillo, California base. Motorsport, street-performance and specialized applications use its calipers, rotors, master cylinders, valves, fittings and brake lines. Correct component selection depends on the requirements of the entire braking system.

Technical Details

• Manufacturer part number: 140-15844. Quantity: one kit for the stated axle/application.
• Rotor specification: 12.88-inch outside diameter × 1.10-inch thickness; GT slotted faces. Spec-37 Iron construction; GT 48 Curved Vane design; published vane configuration: 48 CV.
• Rotor hats: aluminum, black e-coat finish; Big Brake Hat - Flared Bell. Hat offset: 2.035 inch.
• Service caliper: Forged Narrow Superlite 4R; 4 pistons; stainless piston material. Radial mounting, black powder coat finish.
• Published piston bores: 1.12, 1.12 inches. Supplied pad compound: BP-10.
• Caliper hydraulic inlet: 1/8-27 NPT.
• No replacement wheel hubs are supplied; retain or provide the documented matching hub arrangement.
• Wheel mounting patterns: 5 x 4.50; 5 x 4.75; 5 x 5.00 inches.
• Rear housing interface: Big Ford New Style; axle offset: 2.50 in; 63.5 mm.
• Minimum nominal wheel diameter: 17 inches. The wheel must also clear the actual caliper and rotor profile in the installation drawing.
• Separate electronic parking calipers, controller, wiring harness and switch are included. EPB actuation is electrical; hydraulic service braking remains independent.
• Mounting hardware and the specified pads are included. Spindles, master cylinder and brake booster are not supplied.
• Brake hoses are not included. Select suitable braided lines and fittings for the installation.

Fitment & Compatibility

Application is controlled by the Big Ford new-style housing flange and a measured 2.50-inch axle offset. The application table lists a 1990 Lincoln Town Car, but the manufacturer does not currently confirm that model application. Do not order for a Town Car by year/model alone; verify the housing-end drawing, bearing retainer and offset first. Check axle-flange diameter, wheel seating, wheel profile and EPB motor clearance through suspension travel. The electronic parking system is for stationary parking hold, not an emergency stop brake. Mounting brackets must allow both service and parking calipers to clear the body and suspension. Use the complete application table below for the individual year, submodel, brake configuration and note attached to each entry.

Ask PMB Performance to review the brake configuration if the vehicle has been modified. Our 20+ years of parts and fitment experience help identify the axle, spindle and wheel details that need to match before the kit is selected.

Manufacturer documentation: Installation instructions; Technical bulletin.

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.