Wilwood Aero4 Type III Caliper, 1.98-Sq-In Area / Four Symmetrical Pistons / 1.10-inch Rotor Width: Gray Aero caliper in an angled view, with a broad branded face, center bridge bolt and pad channel visible above.

Wilwood Aero4 Type III Caliper, 1.98-Sq-In Area / Four Symmetrical Pistons / 1.10-inch Rotor Width

SKU: 120-13338

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Fitment questions?

Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.

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Product details

The equal-bore AERO4 uses four 1.12-inch stainless pistons rather than a handed differential arrangement. This Type III anodized radial caliper is specified for a nominal 1.10-inch rotor width and a type 6617 pad cavity. For motorsport, street-performance and specialized braking applications, Wilwood Engineering designs and manufactures calipers, brake rotors, master cylinders, valves, fittings and brake lines. The disc brake company was founded by Bill Wood in 1977 and is based in Camarillo, California.

Technical Details

  • Manufacturer part number: 120-13338. Component: Aero4 Radial Mount caliper.
  • Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
  • Nominal rotor width 1.10 inch; compatible outside diameter from 12.19 through 15.00 inches. Specified rotor-width limits: 1.00–1.10 inch.
  • Construction and surface: forged aluminum housing finished in Type III anodize.
  • Bore configuration 1.12 inches across 4 pistons; piston material: stainless steel. Hydraulic effective area: 1.98 square inches.
  • Pad fit is type 6617. Match the pad dimensions and compound to the rotor and intended braking conditions.
  • Caliper weight: approximately 6.9 lb.
  • Piston dust boots: not fitted.
  • Bracket interface: 7.09-inch radial centers with 0.45-inch holes. Specified mount height: 2.09 inches; orientation: universal.
  • Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.

Fitment & Compatibility

Choose an axle application from the brake system’s hydraulic and mechanical requirements, not from the AERO4 name alone. Verify the 1.00–1.10-inch rotor-width range and 7.09-inch radial pattern, with the bracket placing the pads at the correct radius.

PMB Performance has worked with brake components for over 20 years. Share the required piston sizing, rotor measurements and bracket drawing for help checking the match.