Fitment questions?
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Product details
Wilwood Aero4-DS calipers must be matched by width and mounting configuration. This red brake caliper has 1.38/1.38-inch bore dimensions, a 7.09-inch mounting span and the 1.10-inch-wide rotor specification. The Aero4-DS combines four hydraulic pistons with dust wiper seals. Its radial attachment must be aligned to the rotor centerline with the correct bracket; the caliper alone does not establish a wheel or vehicle fit. 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.
Technical Details
- Manufacturer part number: 120-15598-RD
- Component: Aero4-DS Radial Mount; one individual caliper
- Placement: Universal mounting orientation; verify axle position
- Construction and finish: Forged aluminum; Red Powder Coat
- Nominal rotor width: 1.10 inches
- Rotor width range: 1.00–1.10 inches
- Rotor diameter range: 12.19–15.00 inches
- Caliper weight reference: 6.9 lb
- Pistons: 4; stainless steel; bore dimensions 1.38/1.38 inches
- Hydraulic piston area: 3.00 square inches
- Dust boots: Yes
- Brake pad shape: 6617; shape number does not specify a friction compound
- 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
Fitment & Compatibility
Match the 7.09-inch radial attachment to the existing bracket, then check caliper centering over the 1.10-inch nominal-width rotor. Axle placement is determined by the engineered brake package, not by a generic caliper designation. The 1/8-27 NPT connection must use the correct fitting and seal. Check the full wheel envelope with the actual bracket and rotor installed.
Wilwood caliper specifications
PMB Performance has over 20 years of experience with parts and brake fitment. Send the installed rotor dimensions, bracket measurements and hydraulic details so we can help compare the component before you order.
