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Product details
The red DynaPro is a forged four-piston caliper with 1.38-inch stainless pistons and a nominal 0.81-inch rotor opening. It has the smaller-area hydraulic configuration of this lug-mount range. The color is a finish selection; the piston specification and mounting geometry establish the working 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: 120-9703-RD
- Caliper type: Dynapro Lug 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: 0.81 inch
- Rotor thickness limits: 0.75–0.83 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
Match the 5.25-inch lug bracket and rotor centerline with the exact drawing. Check the thickness limits, pad support and wheel clearance around the full body and fitting. A different DynaPro bore changes brake balance, so confirm the system’s intended piston area rather than selecting on external appearance.
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.
