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Product details
This red Powerlite combines the 1.38-inch stainless piston option with the wider 0.86-inch nominal rotor opening. Its forged body carries four pistons and mounts radially on a suitable bracket. It is supplied as an individual caliper for a dimensionally compatible brake conversion or matching component replacement. Founded in 1977 by Bill Wood, Wilwood Engineering is based in Camarillo, California. Its disc brake systems and components serve motorsport, street-performance and specialized applications. Calipers, brake rotors, master cylinders, valves, fittings and brake lines are among its products, selected according to the complete brake system’s requirements.
Technical Details
- Manufacturer part number: 120-8729-RD
- Caliper type: Powerlite Radial Mount
- Construction: Forged Aluminium
- Finish: Red 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
Check the actual rotor thickness and the complete mounting outline against the package drawing. Radial spacing, mount height and lateral offset must place the pads correctly. Verify wheel-barrel and spoke clearance around the body and fitting, then confirm the hydraulic sizing required by the published piston area.
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.
