{"product_id":"all-balls-racing-rzr-pro-xp-and-rs1-rear-caliper-piston-kit","title":"All Balls Racing RZR Pro XP \u0026 RS1 Rear Caliper Piston Kit (2020-2026)","description":"\u003cp\u003e\u003cstrong\u003eThe 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.\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003cp\u003eSearching 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.\u003c\/p\u003e\u003cp\u003eKit contents per All Balls: caliper piston x2.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrades OEM steel, composite or aluminum pistons to 304 stainless steel, per All Balls\u003c\/li\u003e\n\u003cli\u003eEliminates OEM ceramic inserts that can crack under heavy load and high heat\u003c\/li\u003e\n\u003cli\u003e304 stainless resists the corrosion found on chrome-plated pistons and will not turn brittle like composite pistons\u003c\/li\u003e\n\u003cli\u003eStainless steel conducts up to 90% less heat than aluminum, sending less heat into the caliper and fluid, per All Balls\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eBuilt To Solve: Worn Polaris RZR Pro XP and RZR RS1 Rear Stainless Brake Caliper Piston Kit Problems\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCorroded, pitted or sticking caliper pistons\u003c\/li\u003e\n\u003cli\u003eBrittle composite pistons that crack\u003c\/li\u003e\n\u003cli\u003eHeat fade from pistons that pass heat to the fluid\u003c\/li\u003e\n\u003cli\u003eRepeat sticking after seal-only rebuilds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eBest For: Polaris RZR Pro XP and RZR RS1 Owners Rebuilding The Brakes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRZR Pro XP owners replacing worn caliper pistons\u003c\/li\u003e\n\u003cli\u003eRiders in sand, mud and water who wear brakes fast\u003c\/li\u003e\n\u003cli\u003eHigher-hour trail and work machines\u003c\/li\u003e\n\u003cli\u003eOwners doing their own brake service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: All Balls Racing\u003c\/li\u003e\n\u003cli\u003eProduct type: rear stainless brake caliper piston kit\u003c\/li\u003e\n\u003cli\u003eContents: Caliper piston x2\u003c\/li\u003e\n\u003cli\u003eKit type: rear stainless brake caliper piston kit\u003c\/li\u003e\n\u003cli\u003ePosition (per All Balls): rear\u003c\/li\u003e\n\u003cli\u003eMaterial: 304 stainless steel\u003c\/li\u003e\n\u003cli\u003eCountry of origin: China\u003c\/li\u003e\n\u003cli\u003eManufacturer Part Number: 18-9049\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eAll Balls lists this rear stainless brake caliper piston kit for the following UTVs:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePolaris RZR Pro XP (2020-2024, 2026)\u003c\/li\u003e\n\u003cli\u003ePolaris RZR RS1 (2020-2022)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePosition by machine, per All Balls:\u003c\/p\u003e\n\u003cul\u003e\u003cli\u003eRear: Polaris RZR RS1; Polaris RZR Turbo\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003eFitment is based on the manufacturer's application data. Fitment is not guaranteed on unlisted models; confirm your exact year, model and package before ordering.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eWhy replace the RZR Pro XP caliper pistons with stainless?\u003c\/h3\u003e\n\u003cp\u003eOEM 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.\u003c\/p\u003e\n\u003ch3\u003eWhat comes in the kit?\u003c\/h3\u003e\n\u003cp\u003eAll Balls lists two caliper pistons.\u003c\/p\u003e\n\u003ch3\u003eWhich models does it fit?\u003c\/h3\u003e\n\u003cp\u003eAll Balls lists Polaris RZR Pro XP (2020-2024, 2026); Polaris RZR RS1 (2020-2022).\u003c\/p\u003e\n\u003ch3\u003eWhich position does it fit?\u003c\/h3\u003e\n\u003cp\u003eAll Balls lists this part for the rear position on the machines it covers. Confirm your exact year and model in the fitment list.\u003c\/p\u003e\n\u003ch3\u003eIs installation difficult?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch3\u003eDo I need a caliper rebuild kit as well?\u003c\/h3\u003e\n\u003cp\u003eUsually yes. New seals and boots should go in with new pistons, so pair this with the matching All Balls caliper rebuild kit.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy All Balls Racing\u003c\/h2\u003e\n\u003cp\u003eAll 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eComplete Your RZR Pro XP Brake Service\u003c\/h2\u003e\n\u003cp\u003eConfirm 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Why replace the RZR Pro XP caliper pistons with stainless?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"What comes in the kit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"All Balls lists two caliper pistons.\"}}, {\"@type\": \"Question\", \"name\": \"Which models does it fit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"All Balls lists Polaris RZR Pro XP (2020-2024, 2026); Polaris RZR RS1 (2020-2022).\"}}, {\"@type\": \"Question\", \"name\": \"Which position does it fit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"All Balls lists this part for the rear position on the machines it covers. Confirm your exact year and model in the fitment list.\"}}, {\"@type\": \"Question\", \"name\": \"Is installation difficult?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The caliper is disassembled, the old pistons are pushed out and the new stainless pistons go in with fresh seals. 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