Wilwood Anodized FSLI Caliper for 1.25-Inch-Wide Rotors, Four-Piston / 1.62-Inch Bore

The wide-rotor anodized FSLI is configured with four 1.62-inch stainless pistons. Its nominal 1.25-inch rotor-width channel and 4.12-square-inch effective area must be selected together as part of the brake design. Bill Wood founded Wilwood Engineering in 1977, and the company is based in Camarillo, California. It designs and manufactures disc brake systems and a component range of calipers, brake rotors, master cylinders, valves, fittings and brake lines serving motorsport, street-performance and specialized installations.

Technical Details

• Manufacturer part number: 120-11133. 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.
• Pistons: 4 stainless steel; bore specification: 1.62 inches. Effective piston area: 4.12 sq in.
• Piston dust boots: not fitted.
• Caliper weight: approximately 5.2 lb.
• Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
• Compatible brake pad shape: 7420; choose the required compound for the brake system.
• Body: forged aluminum; finish: Type III anodize.
• Mounting: lug, 3.50-inch centers; universal orientation. Mount holes: 0.45 inch; height: 2.85 inches.
• Rotor compatibility: nominal width 1.25 inch; diameter 11.75–13.06 inches. Specified rotor-width limits: 1.19–1.38 inch.

Fitment & Compatibility

Check the wider rotor's lateral position before using the 3.50-inch lug bracket. Symmetrical pistons permit either-side mounting with correct bleed orientation; they do not create a model-specific fit.

For a replacement or custom installation, send PMB Performance the brake dimensions and existing component identification. Our 20+ years of experience can help narrow down the correct combination.