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Product details
A forged aluminum body and four 1.12-inch stainless pistons make up this red Wilwood AERO4 hydraulic brake caliper. It uses 7.09-inch radial mounting centers and a nominal 0.81-inch rotor-width specification. The matching bracket must position the pads correctly over the rotor. Bill Wood founded Wilwood Engineering in 1977. Based in Camarillo, California, Wilwood designs and manufactures disc brake systems and parts for motorsport, street-performance and specialized applications, from calipers and rotors to master cylinders, valves, fittings and brake lines.
AERO4 uses four pistons in a radial-mount body with internal fluid ports. The caliper must be positioned for full pad contact and adequate wheel clearance; rotor diameter alone cannot establish either condition.
Technical Details
- Manufacturer part number: 120-14004-RD
- Component: Wilwood AERO4; one caliper
- Mounting: universal side configuration; Radial; 7.09-inch centers; 0.45-inch mounting holes
- Piston arrangement: 4 pistons; 1.12-inch bores; stainless steel
- Hydraulic piston area: 1.98 square inches, as specified by Wilwood
- Rotor width: 0.81-inch nominal; 0.75–0.81-inch permitted range
- Rotor diameter range: 12.19–15.00 inches
- Pad shape: Wilwood type 6617; compound selected separately
- Body and finish: Forged aluminum; Red Powder Coat
- Fluid inlet: 1/8-27 NPT
- Dust boots: No
- Mount height: 2.09 inches
Fitment & Compatibility
Check the caliper-to-bracket attachment and rotor offset before ordering. Changing piston diameter changes hydraulic requirements even when a different caliper shares the same bolt spacing.
This listing covers one caliper. Match the brake pads, rotor, hose and mounting arrangement to the complete brake system.
Ask PMB Performance for help comparing this caliper with your existing assembly. Our over 20 years of experience are most useful when you provide rotor size, mounting details and the current piston configuration.
