Wilwood FNSL4R Black Four-Piston Brake Caliper, 2.46-Sq-In / 1.10-Inch Rotor Width

This black FNSL4R has four 1.25-inch stainless bores and a 2.46-square-inch effective piston area. Its forged body accepts 7416 pads and is configured for nominal 1.10-inch rotor width. With a range spanning calipers, brake rotors, master cylinders, valves, fittings and brake lines, Wilwood Engineering designs and manufactures complete disc braking systems and their components. Bill Wood founded the Camarillo, California-based company in 1977 for a market now covering motorsport, street-performance and specialized applications.

Technical Details

• Manufacturer part number: 120-11783-BK. Component: Forged Narrow Superlite 4 Radial Mount caliper.
• Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
• Body: forged aluminum; finish: Black powder coat.
• Caliper weight: approximately 5.0 lb.
• Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
• Compatible brake pad shape: 7416; choose the required compound for the brake system.
• Piston dust boots: not fitted.
• Pistons: 4 stainless steel; bore specification: 1.25 inches. Effective piston area: 2.46 sq in.
• Rotor compatibility: nominal width 1.10 inch; diameter 11.75–14.00 inches. Specified rotor-width limits: 1.00–1.10 inch.
• Mounting: radial, 5.98-inch centers; universal orientation. Mount holes: 0.39 inch; height: 1.45 inches.

Fitment & Compatibility

Check the bracket, hat and caliper as a complete radial-mount assembly. The 5.98-inch centers are shared with other bore and width configurations, so verify the actual hydraulic and rotor specifications.

PMB Performance brings more than 20 years of experience to brake-part selection. Include the existing caliper, rotor and mounting details when requesting help with this assembly.