Polaris TRAIL BOSS 325 2001 Manual page 256

BRAKES
REAR CALIPER REMOVAL/INSPECTION
1. Clean caliper area before removal.
2. Using a flare nut wrench, remove hand brake (inner) and
auxiliary brake (outer) lines. Place a container to catch
brake fluid draining from brake lines.
3. Remove caliper.
4. Remove brake pad retaining pin pads, and pad spacer.
NOTE: This is a spring pin. Do not spread apart farther than
necessary to remove it.
5. Remove Allen head screw and separate caliper halves
and remove pistons with piston pliers.
6. Remove O-rings and clean O-ring grooves.
7. Clean disc, caliper body, and pistons with brake cleaner
or alcohol.
9.24
Remove inner
and outer
brake lines