Wilwood Rear UTV6 Racing Brake Kit for Polaris RZR Pro XP (2020–2023), Hard-Anodized, BP-28 Pads

For Polaris RZR Pro XP (2020–2023), this rear UTV6 Race kit uses hard-anodized Wilwood calipers and plain face rotors. Its 6-piston hydraulic layout and 11.25-inch rotor diameter need to be checked against the actual hub, upright and wheel arrangement. Bill Wood founded Wilwood Engineering in 1977. Based in Camarillo, California, the company makes disc-brake systems for street-performance, motorsport and specialized applications. Its calipers, brake rotors, master cylinders, valves, fittings and brake lines are selected around the demands of the complete braking installation.

Technical Details

• Manufacturer part number: 140-17323; supplied as an axle kit.
• Hydraulic lines: Hydraulic flexlines and fittings are not included; select compatible lines for the complete installation.
• Brake rotor size: 11.25-inch outside diameter × 0.25-inch thickness; solid construction.
• Hydraulic sizing: cataloged bore sizes 1.00, 1.00, 1.00 inches; piston area 2.37 square inches; inlet M10 x 1.25.
• Rotor specification: Material: Steel; Type: Drilled Steel Rotor; Style: Plain Face; Surface Finish: Black Electro Coat.
• Supplied friction pads: BP-28 compound; match operating conditions to the intended use.
• Service calipers: UTV6; 6 pistons per caliper; Type III Anodize; lug mounting; stainless pistons.
• Hardware and retained components: Mounting hardware supplied; existing wheel hubs retained; spindles, master cylinder and brake booster are not included.
• Wheel envelope: 15-inch minimum nominal wheel diameter; verify the entire wheel-clearance drawing, including spoke and barrel shape.

Fitment & Compatibility

A Pro XP rear racing package with BP-28 pads, this kit covers the RZR Pro XP and Pro XP 4 derivatives individually listed below. Match the model year and OE rear hub to DS1553 and retain stock wheel studs; aftermarket studs may prevent proper engagement. The 11.25-inch solid steel rotor attachment and 15-inch wheel envelope require checking. New flexlines are not included. This is a racing selection; review the pad operating range and maintenance requirements before use. Use the fitment table below to check the complete application and option notes.

Talk to PMB Performance about the installed brake arrangement if you need a fitment check. Over 20 years of parts experience informs our review of your VIN, photos and component dimensions.

Review Installation instructions for the complete installation and clearance requirements.

Manufacturer Warning

Applicable to brake pads only. WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.