2010 Polaris Sportsman 850 Service Manual, Page 316Get this manual
BRAKES BRAKE DISC SERVICE
Disc Inspection
12Visually inspect the brake disc for scoring, scratches, or gougesReplace the disc if any deep gouges are evidentMeasure the disc thickness at different points around the pad contact surface using 01" micrometerReplace disc if worn beyond service limit
Image shown is for reference only
Disc RemovalReplacement
12Loosen the (4) wheel nutsElevate and support the side of the ATV in which the brake disc is being serviced
= In mmBrake Disc Thickness New: .187" (4.75 mm) Service Limit: .167" (4.24 mm)
CAUTION
Use care when supporting vehicle so that it does not tip or fallSevere injury may occur if machine tips or falls34Remove the wheel nuts and wheelRemove the cotter pin, castle nut and cone washers