Wilwood Forged Narrow Superlite 4R, 4-Piston Radial Brake Caliper, Yellow, 1.38-Inch Bore for 0.81-Inch-wide Rotor

Match this yellow Wilwood Forged Narrow Superlite 4R to a brake assembly requiring 0.81-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: 120-14055-Y
• Mounting: universal side configuration; Radial; 5.98-inch centers; 0.39-inch mounting holes
• Mount height: 1.45 inches
• Rotor width: 0.81-inch nominal; 0.75–0.84-inch permitted range
• Rotor diameter range: 11.75–14.00 inches
• Pad shape: Wilwood type 7416; compound selected separately
• Piston arrangement: 4 pistons; 1.38-inch bores; stainless steel
• Hydraulic piston area: 3.00 square inches, as specified by Wilwood
• Body and finish: Forged aluminum; Yellow Powder Coat
• Fluid inlet: 1/8-27 NPT
• Dust boots: No
• Component: Wilwood Forged Narrow Superlite 4R; one caliper

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’s team has over 20 years of experience with brake components and fitment. We can help review this caliper against the dimensions and hydraulic requirements of your brake system.