Wilwood Rear 12.88-Inch GT/EPB Kit for Big Ford New Style, 2.50-Inch Offset — Black FNSL4R, Six-Lug

This Big Ford New Style rear conversion uses black FNSL4R calipers and 12.88-inch GT-slotted rotors with separate electric parking calipers. The six-lug, 2.50-inch-offset installation includes EPB controls and BP-10 service pads. From its base in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. Founded by Bill Wood in 1977, the company also produces the individual calipers, brake rotors, master cylinders, valves, fittings and brake lines used in these installations. Selection should account for how each component works within the complete brake system.

Technical Details

• Manufacturer part number: 140-18152
• Service calipers: Forged Narrow Superlite 4R; 4 pistons; radial mount; Black Powder Coat
• Brake rotors: 12.88 x 1.10 inches; Spec-37 Iron; GT Slotted; vented construction
• Pads: BP-10; piston material: Stainless
• Caliper body material: Forged aluminum
• Hydraulic inlet: 1/8-27 NPT
• Rotor/hat wheel-stud clearance pattern(s): 6 x 5.5 in; 6 x 139.7 mm; match the installed hub/axle pattern
• Housing/flange application: Big Ford New Style
• Required axle offset: 2.50 in; 63.5 mm
• Parking equipment: separate electric calipers, controller and harness included
• Hydraulic brake hoses: not included; select the correct application-specific lines/fittings
• Wheel clearance: 17-inch wheels may fit; verify the manufacturer’s complete caliper/rotor template for the installed wheel
• Supplied as one kit with mounting hardware; spindles, hubs, master cylinder and booster are not included

Fitment & Compatibility

For this Superlite/EPB kit, the Big Ford New Style flange and 2.50-inch axle offset govern alignment of the 12.88-inch rear rotor. The axle must use a six-lug 6 x 5.5-inch pattern. Do not infer a stock-axle fit from the generic 1990 Town Car table entry; confirm the actual housing, register and flange dimensions.

The axle flange is limited to 6.61 inches and requires a 0.050-inch x 45-degree chamfer; check the 2.80-inch register against DS1650. Include clearance for the separate parking calipers in the wheel check. The EPB controller and harness are supplied, while hydraulic hoses and fittings remain separate installation items.

Use the fitment table below to confirm the exact year, model, trim and installation notes.

The electric parking brake is for stationary parking, not an emergency-stop brake. Applying it while the vehicle is moving can lock the rear wheels and cause a skid. Follow the wiring and holding-test procedures in the manufacturer’s instructions.

Manufacturer Resources

• Exact Wilwood kit specifications and wheel-clearance information
• Installation instructions and component list
• Axle-offset measurement worksheet

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.

Ask PMB Performance to help confirm the configuration before ordering if the vehicle has modified brakes or running gear. We have over 20 years of experience with parts and fitment; a VIN plus the installed component details gives us the best starting point.

Vehicle Applications

Application Notes

1. Line kit included (manufacturer): None