2010 Polaris Sportsman 850 Service Manual, Page 314Get this manual
BRAKES 2Remove mounting bracket, pin assembly and dust boot
Caliper Inspection
1Inspect caliper body for nicks, scratches or wearMeasure bore size and compare to specificationsReplace if damage is evident or if worn beyond service limitUsing hammer and small punch, remove the piston from the caliper body, then remove the square O-rings (see "BRAKE CALIPERExploded View")
= In mmFront Calipers: Caliper Bore I.DRefer to Specifications on Page 11.2 Rear Caliper(s): Caliper Bore I.DRefer to Specifications on Page 11.2 24Clean the caliper body, piston, and mounting bracket with brake cleaner or denatured alcoholInspect piston for nicks, scratches, wear or damageMeasure diameter and replace if damaged or worn beyond service limit