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Product details
The black powder-coated Narrow DynaPro is a compact four-piston component using the thin-pad layout and a 0.25-inch rotor opening. There is a conflict between this part’s stated 1.96-square-inch piston area and its published bore fields. Confirm the correct piston specification before purchasing it as a replacement for a known hydraulic package. 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: 120-18086-BK
- Caliper type: Narrow Dynapro Radial Mount
- Construction: Billet Aluminium
- Finish: Black Powder Coat
- Piston configuration: Four pistons; published bore and piston-area information require confirmation before selection
- Piston type: Stainless
- Piston count: 4
- Dust boots: No
- Nominal rotor width: 0.25 inch
- Rotor thickness limits: 0.25–0.25 inches
- Rotor diameter limits: 10.75–12.19 inches
- Mounting style: Radial
- Handedness: Not restricted to one side; correct mounting and bleed orientation required
- Mounting centers: 4.75 inches
- Mounting-hole size: 0.39 inch
- Mount height: 1.61 inch
- Hydraulic inlet thread: M10 x 1.25
- Required pad shape: 7812
- Published pad area: 6.36 square inches
- Published pad volume: 2.1 cubic inches
- Manufacturer-listed component weight: 4.1 lb
Fitment & Compatibility
Use the exact caliper identity during the compatibility check; a shared color or body outline cannot resolve the bore issue. Once confirmed, compare the radial bracket, rotor centerline and pad contact with the drawing. The M10 inlet thread, wheel-spoke envelope and bleed-screw orientation remain separate installation requirements.
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.
