Wilwood FNSL4R Four-Piston Caliper, Anodized / 1.12-Inch Bores / 1.10-inch Rotor Width

The Type III anodized FNSL4R has four equal 1.12-inch stainless pistons in a narrow radial-mount body. It is sized for a nominal 1.10-inch rotor width and the 7416 pad arrangement. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. It designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications.

Technical Details

• Manufacturer part number: 120-11782. 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.
• Piston dust boots: not fitted.
• Caliper weight: approximately 5.0 lb.
• Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
• Pistons: 4 stainless steel; bore specification: 1.12 inches. Effective piston area: 1.98 sq in.
• Mounting: radial, 5.98-inch centers; universal orientation. Mount holes: 0.39 inch; height: 1.45 inches.
• Compatible brake pad shape: 7416; choose the required compound for the brake system.
• Rotor compatibility: nominal width 1.10 inch; diameter 11.75–14.00 inches. Specified rotor-width limits: 1.00–1.10 inch.
• Body: forged aluminum; finish: Type III anodize.

Fitment & Compatibility

Use its small 1.98-square-inch effective area when checking hydraulic balance. Match the 5.98-inch radial bracket and rotor offset; symmetrical bores allow either side with correct bleed orientation.

PMB Performance has over 20 years of brake-component experience. Send the existing caliper identification, rotor measurements and bracket details for help matching this configuration.