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Product details
The wide-rotor DynaPro in this listing uses four 1.38-inch stainless pistons and a black forged housing. It is configured for a nominal 1.25-inch-wide rotor and a 5.25-inch lug mount. The smaller piston area distinguishes it hydraulically from an otherwise similar 1.75-inch-bore body. Bill Wood founded Wilwood Engineering in 1977; the company is based in Camarillo, California. Wilwood designs and manufactures disc brake systems and components, from calipers and brake rotors to master cylinders, valves, fittings and brake lines, for motorsport, street-performance and specialized applications; selection depends on the complete brake system.
Technical Details
- Manufacturer part number: 120-9701
- Caliper type: Dynapro Lug 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: 1.25 inch
- Rotor thickness limits: 1.19–1.27 inches
- Rotor diameter limits: 10.00–13.06 inches
- Mounting style: Lug
- Handedness: Not restricted to one side; correct mounting and bleed orientation required
- Mounting centers: 5.25 inches
- Mounting-hole size: 0.39 inch
- Mount height: 2.10 inch
- Hydraulic inlet thread: 1/8-27 NPT
- Required pad shape: 7812
- Published pad area: 6.36 square inches
- Published pad volume: 2.1 cubic inches
- Manufacturer-listed component weight: 3.8 lb
Fitment & Compatibility
Compare the piston size required by the complete brake design before selecting the caliper. Check rotor thickness within 1.19–1.27 inches, bracket offset and pad alignment. The 2.10-inch mount height, inlet fitting and available wheel clearance must also agree with the package rather than being assumed from the DynaPro name.
For help identifying the correct brake component, provide the caliper markings and installation dimensions. PMB Performance has over 20 years of experience with parts and brake-system details.
