Wilwood Black Right XRS6R Six-Piston Caliper, 4.04-Square-Inch Area / Radial Mount

The black right-hand XRS6R is a six-piston Wilwood caliper with a nominal 1.10-inch rotor channel. Its 4.04-square-inch piston area distinguishes it hydraulically, while the forged X-bridge body and radial mount define the external installation requirements. From its base in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems and components. Bill Wood founded the company in 1977; its motorsport, street-performance and specialized range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines.

Technical Details

• Manufacturer part number: 120-17211-BK. Type: Forged XRS6R Radial Mount caliper.
• Black Powder Coat finish on a forged aluminum body.
• 6-piston hydraulic layout with 1.62/1.12/1.12-inch bores and 4.04 sq in of effective area; piston type: stainless steel.
• 5.98-inch-center radial attachment, right hand orientation. 0.39-inch holes; 1.45-inch mounting height.
• Component: one individual hydraulic brake caliper. Select the mating rotor, pads, mounting hardware and line connection to suit the complete brake assembly.
• Nominal rotor width 1.10 inch; compatible width range 1.00–1.10 inch. Rotor diameter specification: 11.75–14.00 inches.
• Compatible pad profile 10416; confirm thickness and compound for the installation.
• Caliper component weight: approximately 5.2 lb.
• Hydraulic inlet thread: 1/8-27 NPT. Match the fitting thread and sealing arrangement to the brake hose.
• Piston dust boots: no.

Fitment & Compatibility

Measure rotor width and offset, then compare the bracket height and mounting-hole spacing. Confirm sufficient wheel-barrel room around the caliper, retaining hardware and hose fitting before assembly.

PMB Performance brings over 20 years of experience to brake-component selection. Share the installed caliper, rotor size and mounting arrangement so the relevant dimensions can be compared.