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Product details
This side-inlet DynaPro combines four 1.38-inch stainless pistons with the nominal 0.81-inch rotor opening. The anodized forged body includes the center bridge bolt specified for SI versions. Its alternate inlet placement is useful only where the full bracket, rotor and hydraulic hose layout are compatible with the caliper. 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: 120-9703-SI
- Caliper type: Dynapro Lug Mount
- Construction: Forged Aluminium
- Finish: Type III Anodize
- 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
Compare the side-port connection with the available line route and verify the specified fitting thread. The receiving mount needs 5.25-inch lug centers and the correct radial height and offset. Check pad sweep and wheel space, then confirm the smaller piston-area requirement with the master cylinder and the rest of the brake system.
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.
