Wilwood FSLI Black Caliper, Nominal 1.10-Inch Rotor Width / 1.38-Inch Pistons

This black FSLI is identified as the nominal 1.10-inch rotor-width model with four 1.38-inch stainless pistons. The 3.00-square-inch effective area and 7420 pad fit distinguish its brake specification from larger-bore Superlite versions. 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: 120-11129-BK. Component: Forged Superlite Internal 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.
• Body: forged aluminum; finish: Black powder coat.
• Rotor compatibility: nominal width 1.10 inch; diameter 11.75–13.06 inches. Confirm the usable minimum and maximum rotor width before installation.
• Pistons: 4 stainless steel; bore specification: 1.38 inches. Effective piston area: 3.00 sq in.
• Compatible brake pad shape: 7420; choose the required compound for the brake system.
• Caliper weight: approximately 5.2 lb.
• Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
• Mounting: lug, 3.50-inch centers; universal orientation. Mount holes: 0.45 inch; height: 2.85 inches.

Fitment & Compatibility

Confirm the usable rotor-width limits with the exact caliper identification before installation. Match the 3.50-inch lug bracket and rotor centerline without borrowing the limits of a narrower FSLI body.

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.