Wilwood 1.25-Inch Rotor Width FSLI Caliper, Four 1.25-Inch Pistons / 3.50-Inch Lug Mount

This wide-rotor Forged Superlite Internal caliper uses four 1.25-inch stainless pistons and a nominal 1.25-inch rotor-width channel. The four equal bores provide a 2.46-square-inch effective piston area. Wilwood Engineering designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. Bill Wood founded the company in 1977; it is based in Camarillo, California, and its component range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines.

Technical Details

• Manufacturer part number: 120-11127. 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.
• Brake pad profile 7420; select friction material for the actual operating conditions.
• Caliper weight: approximately 5.2 lb.
• The rotor channel is specified for 1.25-inch nominal width. Rotor outside diameter: 11.75 to 13.06 inches. Specified rotor-width limits: 1.19–1.38 inch.
• Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
• Type III anodize finish on a forged aluminum caliper body.
• 4 stainless steel pistons with 1.25-inch bore diameter. The specified effective area is 2.46 sq in.
• Piston dust boots: not fitted.
• 3.50-inch lug mounting pattern, universal; mounting height 2.85 inches and hole size 0.45 inch.

Fitment & Compatibility

Match the caliper's wide channel to the rotor and bracket offset. The familiar 3.50-inch lug pattern does not make every Superlite rotor-width version interchangeable.

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.