Wilwood Anodized FSLI Caliper, 1.10-Inch Rotor-Width Channel / 1.38-Inch Piston Set

Sized for a nominal 1.10-inch-wide rotor, this Type III anodized FSLI carries four 1.38-inch stainless pistons. It is the intermediate-width configuration of the 3.00-square-inch Superlite Internal hydraulic arrangement. For motorsport, street-performance and specialized braking applications, Wilwood Engineering designs and manufactures calipers, brake rotors, master cylinders, valves, fittings and brake lines. The disc brake company was founded by Bill Wood in 1977 and is based in Camarillo, California.

Technical Details

• Manufacturer part number: 120-11129. 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.
• Nominal rotor width 1.10 inch; compatible outside diameter from 11.75 through 13.06 inches. Specified rotor-width limits: 0.94–1.10 inch.
• Construction and surface: forged aluminum housing finished in Type III anodize.
• Pad fit is type 7420. Match the pad dimensions and compound to the rotor and intended braking conditions.
• Bore configuration 1.38 inches across 4 pistons; piston material: stainless steel. Hydraulic effective area: 3.00 square inches.
• Piston dust boots: not fitted.
• Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
• Caliper weight: approximately 5.2 lb.
• Bracket interface: 3.50-inch lug centers with 0.45-inch holes. Specified mount height: 2.85 inches; orientation: universal.

Fitment & Compatibility

Compare the bracket's offset with this specific body width. Correct 3.50-inch hole spacing is only one requirement; the pads must sweep the rotor properly and the wheel must clear the full caliper.

PMB Performance has worked with brake components for over 20 years. Share the required piston sizing, rotor measurements and bracket drawing for help checking the match.