Wilwood Rear C1500 EPB Brake Kit (1988–1998), Black FNSL4R with 12.88-Inch GT Rotors

This Wilwood FNSL4R conversion equips a compatible C1500 rear axle with 12.88-inch GT-slotted brake rotors and black four-piston service calipers. Separate electric parking calipers handle stationary holding, with the controller and wiring harness supplied in the kit. Founded in 1977 by Bill Wood and based in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems and components for motorsport, street-performance and specialized applications. Its range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines, selected to work together within a properly matched brake system.

Technical Details

• Manufacturer part number: 140-18044
• 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): 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: 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 the listed Chevrolet and GMC C1500 pickups with the specified five-lug, two-wheel-drive configuration or Wilwood Iron ProSpindles. Match the 1988–1991 front-brake/F44 distinctions and later applications in the table; the rear housing must have a 3.25-inch axle offset and 5 x 5-inch wheel pattern.

For the 12.88-inch Superlite/EPB assembly, compare the C1500 rear axle with DS1634: a 6.61-inch maximum flange diameter, 0.050-inch x 45-degree chamfer and 3.09-inch register are specified. Table entries that distinguish trucks by front rotor width still describe a rear-kit application here. Select suitable hydraulic hoses separately, and check clearance around both rear calipers using the wheel diagram.

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.

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