Wilwood Type III Anodized Forged Superlite 4R 4-Piston Left Caliper, 0.81-Inch Rotor Width

The 5.98-inch radial pattern identifies the attachment layout of this Wilwood Forged Superlite 4R. This left-hand Type III anodized caliper has 4 pistons, 1.88/1.75-inch bores and a 0.81-inch nominal rotor-width specification. 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.

Internal fluid passages and radial mounting distinguish this four-piston Superlite. The selected piston design and bore sizes must match the brake balance calculation; they are not interchangeable merely because the mounting centers agree.

Technical Details

• Manufacturer part number: 120-13827
• Component: Wilwood Forged Superlite 4R; one caliper
• Mounting: Left hand; Radial; 5.98-inch centers; 0.39-inch mounting holes
• Piston arrangement: 4 pistons; 1.88/1.75-inch bores; stainless steel
• Hydraulic piston area: 5.18 square inches, as specified by Wilwood
• Rotor width: 0.81-inch nominal; 0.75–0.90-inch permitted range
• Rotor diameter range: 11.75–14.00 inches
• Pad shape: Wilwood type 7420; compound selected separately
• Body and finish: Forged aluminum; Type III anodized
• Fluid inlet: 1/8-27 NPT
• Dust boots: No
• Mount height: 1.63 inches

Fitment & Compatibility

Measure the available space at both sides of the rotor, including its hat. Confirm mounting geometry and piston area; rotor width by itself cannot establish a complete brake package.

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.