2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 179Get this manual
BRAKES 3Remove the caliper and pads from the caliperAuxiliary Brake Master Cylinder Fluid Level Between MIN and MAX lines Retaining Pin 4It is recommended that burnishing procedure be performed after installation of new brake pads to extend service life and reduce noiseStart machine and slowly increase speed to 30 mphGradually apply brakes to stop machineRepeat procedure 10 timesSpacer
REAR CALIPER REMOVALINSPECTION
1Clean caliper area before removalRemove inner and outer brake lines 4Remove Allen head screw and separate caliper halves and remove pistons with piston pliers