Wilwood FNSL4R Brake Caliper, Yellow, 11.75–14.00-Inch Rotor Diameter / 1.10-Inch Width

Match this yellow Wilwood Forged Narrow Superlite 4R to a brake assembly requiring 1.10-inch rotor width and 1.38-inch pistons. The 4-piston caliper uses 5.98-inch radial mounting rather than a vehicle-specific adapter supplied as a kit. Wilwood Engineering’s disc brake range includes calipers, rotors, master cylinders, valves, fittings and brake lines. Bill Wood founded the company in 1977 in California; it is based in Camarillo and serves motorsport, street-performance and specialized brake applications.

Technical Details

• Manufacturer part number: 120-14056-Y
• Component: Wilwood Forged Narrow Superlite 4R; one caliper
• Rotor width: 1.10-inch nominal; 1.00–1.10-inch permitted range
• Rotor diameter range: 11.75–14.00 inches
• Mounting: universal side configuration; Radial; 5.98-inch centers; 0.39-inch mounting holes
• Mount height: 1.45 inches
• Piston arrangement: 4 pistons; 1.38-inch bores; stainless steel
• Hydraulic piston area: 3.00 square inches, as specified by Wilwood
• Pad shape: Wilwood type 7416; compound selected separately
• Body and finish: Forged aluminum; Yellow Powder Coat
• Dust boots: No
• Fluid inlet: 1/8-27 NPT

The narrow Superlite 4R has four pistons, radial attachment and removable center bridge access to type 7416 pads. Check the specific rotor-width version before ordering another caliper from the same family.

Fitment & Compatibility

Set up the brake assembly around the specified rotor and pad geometry. Check the mount drawing and wheel envelope, and confirm that the piston area suits the rest of the hydraulic system.

This listing covers one caliper. Match the brake pads, rotor, hose and mounting arrangement to the complete brake system.

PMB Performance has worked with parts and brake fitment for over 20 years. Supply the installed caliper identity and the rotor and bracket measurements for a practical compatibility check.