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Product details
Black powder coating covers this four-piston Powerlite radial caliper. Its stainless pistons have 1.38-inch bores, and the wider body is configured for 0.79–0.86-inch rotor thickness. The 3.00-square-inch published area is a system-sizing detail, not a universal measure of replacement compatibility. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company makes disc brake systems and components for motorsport, street-performance and specialized uses, including calipers, brake rotors, master cylinders, valves, fittings and brake lines; each component must match the requirements of the complete brake system.
Technical Details
- Manufacturer part number: 120-8729-BK
- Caliper type: Powerlite Radial Mount
- Construction: Forged Aluminium
- Finish: Black Powder Coat
- Piston bores: 1.38 / 1.38 inches
- Piston type: Stainless
- Piston count: 4
- Published piston area: 3.00 square inches
- Dust boots: No
- Nominal rotor width: 0.86 inch
- Rotor thickness limits: 0.79–0.86 inches
- Rotor diameter limits: 9.45–11.00 inches
- Mounting style: Radial
- Handedness: Not restricted to one side; correct mounting and bleed orientation required
- Mounting centers: 5.08 inches
- Mounting-hole size: 0.40 inch
- Mount height: 1.56 inch
- Hydraulic inlet thread: 1/8-27 NPT
- Required pad shape: 7912
- Published pad area: 5 square inches
- Published pad volume: 1.8 cubic inches
- Manufacturer-listed component weight: 2.8 lb
Fitment & Compatibility
Identify the installed Powerlite version and compare the bracket’s radial geometry and rotor offset. Check the specified pad shape and friction-track coverage before looking at wheel clearance. The hydraulic inlet and master cylinder must remain appropriate for this piston configuration, especially when changing from a smaller-bore compact caliper.
PMB Performance has over 20 years of experience helping customers with brake and parts fitment. Share the installed component identification and relevant measurements when requesting assistance.
