Wilwood XRS4R Brake Caliper, Red Forged Body, 2.46-Square-Inch Effective Piston Area

Choose this red Wilwood XRS4R when the brake design calls for four 1.25-inch pistons and a 1.10-inch nominal rotor width. Its internal passages eliminate an external fluid crossover, and the open X-bridge provides a recognizable feature of this forged caliper family. Bill Wood established Wilwood Engineering in 1977. Based in Camarillo, California, the company designs and manufactures disc brake systems for motorsport, street-performance and specialized use, including calipers, brake rotors, master cylinders, valves, fittings and brake lines.

Technical Details

• Manufacturer part number: 120-17202-RD. Type: Forged XRS4R Radial Mount caliper.
• Mounting: radial, 5.98-inch centers; orientation: universal. 0.39-inch holes; 1.45-inch mounting height.
• Rotor channel: 1.10-inch nominal width. Specified width limits: 1.00–1.10 inch; rotor outside diameter: 11.75–14.00 inches.
• Brake pad shape: 10416. Choose pad dimensions and friction material for the brake system.
• Piston arrangement: 4 stainless steel pistons; bore specification 1.25/1.25 inches. Effective piston area: 2.46 square inches.
• Hydraulic inlet thread: 1/8-27 NPT. Match the fitting thread and sealing arrangement to the brake hose.
• Caliper body: forged aluminum; finish: Red Powder Coat.
• Caliper component weight: approximately 5.1 lb.
• Component: one individual hydraulic brake caliper. Select the mating rotor, pads, mounting hardware and line connection to suit the complete brake assembly.
• Piston dust boots: no.

Fitment & Compatibility

Match the 10416 pad profile, radial bracket and hose connection to the existing assembly. No front or rear vehicle axle is established merely by the caliper's universal orientation.

For help matching this caliper, contact PMB Performance with the brake-package details and rotor measurements. Our team has more than 20 years of experience with brake parts and fitment.