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Product details
Four 1.25-inch bores give this anodized Wilwood XRS4R its 2.46-square-inch effective piston area. It is a forged four-piston caliper with a nominal 1.10-inch rotor channel, rather than a complete brake conversion matched to a particular chassis. Founded in 1977 by Bill Wood, Wilwood Engineering is based in Camarillo, California. It designs and manufactures disc braking systems for motorsport, street-performance and specialized applications, with a component range covering calipers, brake rotors, master cylinders, valves, fittings and brake lines.
Technical Details
- Manufacturer part number: 120-17202. Type: Forged XRS4R Radial Mount caliper.
- Type III Anodize finish on a forged aluminum body.
- 5.98-inch-center radial attachment, universal orientation. 0.39-inch holes; 1.45-inch mounting height.
- 4-piston hydraulic layout with 1.25/1.25-inch bores and 2.46 sq in of effective area; piston type: stainless steel.
- Compatible pad profile 10416; confirm thickness and compound for the installation.
- Nominal rotor width 1.10 inch; compatible width range 1.00–1.10 inch. Rotor diameter specification: 11.75–14.00 inches.
- Piston dust boots: no.
- Hydraulic inlet thread: 1/8-27 NPT. Match the fitting thread and sealing arrangement to the brake hose.
- Component: one individual hydraulic brake caliper. Select the mating rotor, pads, mounting hardware and line connection to suit the complete brake assembly.
- Caliper component weight: approximately 5.1 lb.
Fitment & Compatibility
Plan the installation around the bracket and master-cylinder sizing as well as the rotor. The permitted rotor-width range is 1.00–1.10 inches; its outside diameter must fall within the specified envelope while keeping the pads correctly positioned.
With 20+ years of experience, PMB Performance can help assess the brake hardware. Provide the caliper number, rotor dimensions and bracket measurements when asking about compatibility.
