All Balls Racing RZR Pro XP & RS1 Rear Caliper Piston Kit (2020-2026)
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The All Balls Racing rear stainless brake caliper piston kit for the Polaris RZR Pro XP and RZR RS1 replaces worn factory parts to cure sticking calipers, leaking seals and weak brakes. It is built to All Balls' application data as a direct replacement, so it goes back in where the original came out and restores firm, consistent braking.
Searching for Polaris RZR Pro XP rear caliper piston, Polaris RZR Pro XP caliper pistons or Polaris RZR Pro XP brake caliper piston kit? Use the exact-model fitment list below to confirm this kit matches your machine.
Kit contents per All Balls: caliper piston x2.
Key Features
- Upgrades OEM steel, composite or aluminum pistons to 304 stainless steel, per All Balls
- Eliminates OEM ceramic inserts that can crack under heavy load and high heat
- 304 stainless resists the corrosion found on chrome-plated pistons and will not turn brittle like composite pistons
- Stainless steel conducts up to 90% less heat than aluminum, sending less heat into the caliper and fluid, per All Balls
Built To Solve: Worn Polaris RZR Pro XP and RZR RS1 Rear Stainless Brake Caliper Piston Kit Problems
- Corroded, pitted or sticking caliper pistons
- Brittle composite pistons that crack
- Heat fade from pistons that pass heat to the fluid
- Repeat sticking after seal-only rebuilds
Best For: Polaris RZR Pro XP and RZR RS1 Owners Rebuilding The Brakes
- RZR Pro XP owners replacing worn caliper pistons
- Riders in sand, mud and water who wear brakes fast
- Higher-hour trail and work machines
- Owners doing their own brake service
Specifications
- Brand: All Balls Racing
- Product type: rear stainless brake caliper piston kit
- Contents: Caliper piston x2
- Kit type: rear stainless brake caliper piston kit
- Position (per All Balls): rear
- Material: 304 stainless steel
- Country of origin: China
- Manufacturer Part Number: 18-9049
Fitment
All Balls lists this rear stainless brake caliper piston kit for the following UTVs:
- Polaris RZR Pro XP (2020-2024, 2026)
- Polaris RZR RS1 (2020-2022)
Position by machine, per All Balls:
- Rear: Polaris RZR RS1; Polaris RZR Turbo
Fitment is based on the manufacturer's application data. Fitment is not guaranteed on unlisted models; confirm your exact year, model and package before ordering.
FAQ
Why replace the RZR Pro XP caliper pistons with stainless?
OEM composite pistons can turn brittle and chrome or aluminum pistons can corrode and stick. All Balls' 304 stainless pistons resist corrosion and carry less heat into the caliper.
What comes in the kit?
All Balls lists two caliper pistons.
Which models does it fit?
All Balls lists Polaris RZR Pro XP (2020-2024, 2026); Polaris RZR RS1 (2020-2022).
Which position does it fit?
All Balls lists this part for the rear position on the machines it covers. Confirm your exact year and model in the fitment list.
Is installation difficult?
The caliper is disassembled, the old pistons are pushed out and the new stainless pistons go in with fresh seals. A caliper rebuild kit is usually replaced at the same time. Bleed the brakes afterward. All Balls does not publish an install sheet for this part.
Do I need a caliper rebuild kit as well?
Usually yes. New seals and boots should go in with new pistons, so pair this with the matching All Balls caliper rebuild kit.
Why All Balls Racing
All Balls Racing specializes in replacement bearings, seals, brake, drivetrain, steering and suspension parts for ATVs and UTVs, packaged by application so the right parts arrive for the job. Its kits are built as direct replacements for the factory parts they cover.
Complete Your RZR Pro XP Brake Service
Confirm your exact year, model and position in the fitment list before ordering. Inspect the pads, rotors, caliper seals and fluid at the same time, and bleed the brakes with fresh fluid after any hydraulic work.
