2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 181Get this manual
BRAKES 6Install brake lines and tighten to specified torque
REAR BRAKE DISC INSPECTION
1Visually inspect disc for scoring, scratches, or gougesReplace the disc if any deep scratches are evident
Hand Brake Line
Rear Brake Disc
Auxiliary Brake Line Measure Thickness 2Use 0-1 micrometer and measure disc thickness at different points around perimeter of discReplace disc if worn beyond service limit
Banjo Bolt Torque 15 ftlbs(21 Nm)