2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 288Get this manual
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BRAKES 2 Remove mounting bracket, pin assembly and dust boot
= In mmFront Calipers: Caliper Bore I.DStd: 1.192" (30.28 mm) Service Limit: 1.194" (30.33 mm) Rear Calipers: Caliper Bore I.DStd: 1.