Wilwood Aero4 Red Left Four-Piston Caliper, Nominal 1.25-Inch Rotor Width / Standard Pads: Red Aero caliper in an angled view, with a broad branded face, center bridge bolt and pad channel visible above.

Wilwood Aero4 Red Left Four-Piston Caliper, Nominal 1.25-Inch Rotor Width / Standard Pads

SKU: 120-13286-RD

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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

A red powder-coated left AERO4, this caliper combines a four-piston forged body with 1.88/1.62-inch stainless bores. Its 6617 pad arrangement and internal fluid ports are intended for a properly aligned radial brake assembly. This component comes from Wilwood Engineering, established in 1977 by Bill Wood and based in Camarillo, California. Its disc brake design and manufacturing work includes calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized systems.

Technical Details

  • Manufacturer part number: 120-13286-RD. 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.
  • Piston dust boots: not fitted.
  • Bracket interface: 7.09-inch radial centers with 0.45-inch holes. Specified mount height: 2.09 inches; orientation: left hand.
  • Bore configuration 1.88/1.62 inches across 4 pistons; piston material: stainless steel. Hydraulic effective area: 4.84 square inches.
  • Caliper weight: approximately 6.8 lb.
  • Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
  • Pad fit is type 6617. Match the pad dimensions and compound to the rotor and intended braking conditions.
  • Nominal rotor width 1.25 inch; compatible outside diameter from 12.19 through 15.00 inches. Specified rotor-width limits: 1.10–1.28 inch.
  • Construction and surface: forged aluminum housing finished in Red powder coat.

Fitment & Compatibility

Select the left-side installation and check an actual rotor width between 1.10 and 1.28 inches. The 12.19–15.00-inch diameter capacity must be considered with the bracket’s radial height and the available space inside the wheel.

For a replacement or custom installation, send PMB Performance the brake dimensions and existing component identification. Our 20+ years of experience can help narrow down the correct combination.