2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 290Get this manual
BRAKES BRAKE DISC SERVICE
Disc Inspection
1Visually inspect the brake disc for scoring, scratches, or gougesReplace the disc if any deep gouges are evident
Measure 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)
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