Wilwood Rear Red FNSL4R Brakes with EPB — C1500 (1988–1998), 12.88-Inch Drilled/Slotted Rotors

For a C1500 build using red calipers, this Wilwood rear kit pairs four-piston FNSL4R brakes with 12.88-inch SRP drilled-and-slotted rotors. An included controller operates the separate parking calipers; the service brakes remain hydraulic. 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: 140-18044-DR
• Service calipers: Forged Narrow Superlite 4R; 4 pistons; radial mount; Red Powder Coat
• Brake rotors: 12.88 x 1.10 inches; Spec-37 Iron; SRP Drilled & 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.

Confirm the applicable vehicle entry and all numbered notes in the fitment table below.

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.

With over 20 years of parts and fitment experience, PMB Performance can help review the intended brake installation. Provide your VIN, wheel measurements and any modified axle or spindle details when asking about compatibility.

Vehicle Applications

Application Notes

1. Line kit included (manufacturer): None