2005 Polaris Sportsman 400/500 Service Manual, Page 255Get this manual
.94 in23.88 mm 1.5 in38.1 mm O-Rings 10Inspect caliper piston bore for scratches, severe corrosion, or galling and replace if necessary2Carefully assemble caliper body, making sure O-rings are properly positioned in grooveTighten the caliper anvil bolts and then torque the anvil bolts evenly to 1618 ftlbs(2225 Nm)1618 ft.lbs(2225 Nm)