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Product details
The anodized Narrow DynaPro radial caliper combines four 1.62-inch stainless pistons with a body specified for a 0.25-inch-wide rotor. This thin-pad configuration uses 4.75-inch radial mounting centers and an M10 x 1.25 hydraulic connection. Its narrow package must be selected by the installed brake geometry rather than by the vehicle badge. 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: 120-17870
- Caliper type: Narrow Dynapro Radial Mount
- Construction: Billet Aluminium
- Finish: Type III Anodize
- Piston bores: 1.62 / 1.62 inches
- Piston type: Stainless
- Piston count: 4
- Published piston area: 4.12 square inches
- 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
Check the pad thickness and mounting drawing before substituting for another DynaPro model. The exact version lists a 10.75–12.19-inch rotor diameter range and 1.61-inch mount height. Align the pad face to the rotor, verify the wheel envelope, and compare the 4.12-square-inch piston area with the original brake design.
PMB Performance brings over 20 years of brake and parts experience to selection questions. Send the existing caliper reference and brake-package details for help checking compatibility.
