2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 180Get this manual
BRAKES BRAKE PADS
Pad Removal
12Loosen the wheel nutsElevate and support the side of the ATV in which the caliper brake pads are being serviced6Push mounting bracket inward and slip outer brake pad past edgeRemove inner padCaliper image shown may differ from actual caliper used
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 tire(s)Remove caliper from mounting bracket7Measure the thickness of the pad materialReplace pads if worn beyond the service limit