2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 326Get this manual
REAR BRAKE PAD REMOVAL
1Remove caliper mounting bolts and lift caliper off of discNOTE: When removing caliper, be careful not to damage brake lineSupport caliper so as not to kink or bend brake line2Push caliper piston into caliper bore slowly with pads installedNOTE: Brake fluid will be forced through compensating port into master cylinder fluid reservoir when piston is pushed back into caliperRemove excess fluid from reservoir as required