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Product details
Wilwood supplies this left Aero4-ST brake caliper with an anodized finish. Its 7.09-inch mounting span and 1.25-inch-wide rotor configuration are key checks when selecting a single caliper for an existing system. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. Its disc brake design and manufacturing work includes master cylinders, valves, fittings and brake lines as well as rotors and calipers. The company serves motorsport, street-performance and specialized applications in which the entire brake system determines component choice. This Aero4-ST uses four Thermlock insulated pistons with the thick 6620 pad outline. Check the exact unequal bore combination and the 7.09-inch radial mount against the existing installation; the caliper is not selected by color or rotor diameter alone.
Technical Details
- Manufacturer part number: 120-16088
- Component: Aero4 Radial Mount; one individual caliper
- Placement: Left
- Construction and finish: Forged aluminum; Type III Anodize
- Mounting interface: Radial; mounting centers 7.09 inches
- Mounting-hole diameter: 0.45 inches
- Mount height: 2.09 inches
- Hydraulic inlet thread: 1/8-27 NPT
- Pistons: 4; Thermlock insulated; bore dimensions 1.75/1.50 inches
- Hydraulic piston area: 4.17 square inches
- Dust boots: No
- Brake pad shape: 6620; shape number does not specify a friction compound
- Nominal rotor width: 1.25 inches
- Rotor width range: 1.10–1.28 inches
- Rotor diameter range: 12.19–15.00 inches
- Caliper weight reference: 7.1 lb
Fitment & Compatibility
Verify the radial mounting interface and the complete rotor-width range shown above. Use the left-hand caliper and keep the bleed arrangement in the specified orientation. Account for the 1.75/1.50-inch bores when selecting the master cylinder and front-to-rear balance. Check that the 1/8-27 NPT fitting, flexline and wheel remain clear throughout their operating movement.
Wilwood caliper specifications
A correct caliper choice begins with the complete brake arrangement. PMB Performance has over 20 years of parts and fitment experience; send the mounting geometry and rotor dimensions for help with your selection.
