Wilwood Rear Red FNSL4R EPB Package for C1500 (1988–1998), GT-Slotted 14-Inch Rotors

For a C1500 with room for 14-inch rear rotors, this red FNSL4R kit supplies the GT-slotted configuration and electric parking brakes. The hardware is built around the specified C1500 flange and offset, so an axle swap requires measurement before purchase. 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: 140-18045-R
• Rotor specification: Spec-37 Iron, GT Slotted, vented; 14.00 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): 5 x 5 in; 5 x 127 mm; match the installed hub/axle pattern
• Housing/flange application: 88-98 C1500
• Required axle offset: 3.25 in; 82.55 mm
• Parking equipment: separate electric calipers, controller and harness included
• Hydraulic brake hoses: not included; select the correct application-specific lines/fittings
• Wheel clearance: 18-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 1988–1998 Chevrolet/GMC C1500 applications below have configuration-specific limits, including five-lug 4x2 trucks and vehicles using Wilwood Iron ProSpindles. Verify the rear flange, 3.25-inch axle offset and 5 x 5-inch pattern; a year/model match alone is insufficient.

The 14-inch brake package requires a wheel-template check even where an 18-inch wheel is used. Axle preparation must meet the 6.61-inch maximum flange diameter, 0.050-inch x 45-degree chamfer and 3.09-inch register shown in the instructions.

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

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.

PMB Performance brings over 20 years of experience with brake components and fitment details. Send us your VIN together with the installed axle, spindle, brake and wheel specifications if you need help confirming this package.

Vehicle Applications

Application Notes

1. Line kit included (manufacturer): None