Wilwood Rear Red GT-Slotted FNSL4R Kit — 12.88-Inch Mechanical Parking Brakes, Big Ford New Style 2.50-Inch Offset

Red Superlite calipers, GT-slotted rotors and drum-in-hat parking hardware make up this 12.88-inch Big Ford rear conversion. The four-piston service brakes use BP-10 pads, while the parking shoes need a suitable mechanical cable arrangement. The manufacturer is Wilwood Engineering, founded by Bill Wood in 1977 and based in Camarillo, California. It designs and manufactures disc brake components and complete systems, from calipers and brake rotors to valves, master cylinders, fittings and brake lines. Motorsport, street-performance and specialized installations each require those components to be matched to the complete brake system.

Technical Details

• Manufacturer part number: 140-18151-R
• Rotor specification: Spec-37 Iron, GT Slotted, vented; 12.88 x 1.10 inches
• Caliper specification: 4-piston Forged Narrow Superlite 4R in Red Powder Coat; radial mount
• Included service pad compound: BP-10; Stainless pistons
• 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 brake: included internal drum/shoe assembly; cable and clevis hardware are not 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

The 12.88-inch Superlite parking package needs a Big Ford New Style housing with the correct large-bearing flange. Verify the 2.50-inch axle offset and 6 x 5.5-inch lug pattern on the installed axle. The generic Town Car entry is conditional on that hardware and does not establish compatibility with a stock 1990 Town Car rear axle.

The supplied internal parking shoes require separate cables and clevis hardware. Use DS1649 to measure the 2.80-inch axle register, check the 6.80-inch maximum flange diameter and apply the specified edge chamfer. Plan new hydraulic hoses/fittings because the original lines cannot connect directly to this conversion.

The table below provides the full application breakdown; match its year, model and brake-configuration details.

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.

For fitment help, contact PMB Performance with your VIN and details of any axle, spindle or brake changes. Our team has over 20 years of experience checking parts and fitment, including the dimensions that a model-year search cannot establish.

Vehicle Applications

Application Notes

1. Line kit included (manufacturer): None