Wilwood Forged Superlite 4R Thermlock Brake Caliper for 0.75–0.90-Inch Rotor Thickness, Left Type III Anodized

Match this Type III anodized Wilwood Forged Superlite 4R to a brake assembly requiring 0.81-inch rotor width and 1.88/1.75-inch pistons. The left-hand 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.

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: 120-13829
• Component: Wilwood Forged Superlite 4R; one caliper
• Piston arrangement: 4 pistons; 1.88/1.75-inch bores; Thermlock
• Hydraulic piston area: 5.18 square inches, as specified by Wilwood
• Pad shape: Wilwood type 7420; compound selected separately
• Mounting: Left hand; Radial; 5.98-inch centers; 0.39-inch mounting holes
• Mount height: 1.63 inches
• Rotor width: 0.81-inch nominal; 0.75–0.90-inch permitted range
• Rotor diameter range: 11.75–14.00 inches
• Fluid inlet: 1/8-27 NPT
• Dust boots: No
• Body and finish: Forged aluminum; Type III anodized

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.