Fitment questions?
Call (855) 786-7101 or text (801) 304-3141.
Real people. Real answers.
Product details
The larger-bore Powerlite in this listing is the anodized four-piston version for a nominal 0.86-inch-wide rotor. Four 1.38-inch stainless pistons provide the published 3.00-square-inch piston area. It shares the compact radial format with other Powerlite models, but its hydraulic and rotor-width requirements must be matched explicitly. Based in Camarillo, California, Wilwood Engineering was founded by Bill Wood in 1977. The manufacturer produces disc brake systems and components for motorsport, street-performance and specialized applications, with a range covering calipers, brake rotors, master cylinders, valves, fittings and brake lines. Individual components are chosen to suit the complete brake system.
Technical Details
- Manufacturer part number: 120-8729
- Caliper type: Powerlite Radial Mount
- Construction: Forged Aluminium
- Finish: Type III Anodize
- 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
Check mounting centers and the 1.56-inch mount height against the receiving bracket. A rotor in the stated diameter envelope must still align with the pad footprint and fit the 0.79–0.86-inch thickness range. Confirm the wheel envelope and the intended hydraulic balance before substituting this caliper for a smaller-bore version.
With over 20 years of parts experience, PMB Performance can help compare this component with your existing brake assembly. Include its caliper reference and any conversion-kit information.
