Wilwood Small-Bore D52 Rear Brake Caliper, Type III Anodize / 1.28-Inch Rotor Width: Gray D52 caliper showing its white logo, upper pad opening and two mounting ears.

Wilwood Small-Bore D52 Rear Brake Caliper, Type III Anodize / 1.28-Inch Rotor Width

SKU: 120-10938

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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 anodized small-bore D52 is configured for rear brake use with two 1.25-inch stainless pistons. Its 2.46-square-inch piston area distinguishes it from the larger D52 calipers, while the nominal rotor-width channel is 1.28 inches. 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: 120-10938. Component: D52 Dual Piston Floater caliper.
  • Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
  • Pad fit is type D52. Match the pad dimensions and compound to the rotor and intended braking conditions.
  • Caliper weight: approximately 5.5 lb.
  • Hydraulic inlet thread: 7/16-20. Use a fitting with the correct thread and sealing seat.
  • Piston dust boots: not fitted.
  • Nominal rotor width 1.28 inch; compatible outside diameter from 11.00 through 12.19 inches. Specified rotor-width limits: 1.19–1.28 inch.
  • Bore configuration 1.25 inches across 2 pistons; piston material: stainless steel. Hydraulic effective area: 2.46 square inches.
  • Construction and surface: forged aluminum housing finished in Type III anodize.
  • Bracket interface: 7.06-inch floating centers with 0.69-inch holes. Specified mount height: 0.77 inches; orientation: universal.

Fitment & Compatibility

Use only with a rear brake arrangement that requires this hydraulic area and the D52 floating bracket. Check 7.06-inch mounting centers, rotor diameter and the 7/16-20 banjo connection when matching the caliper.

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.