2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 40Get this manual
MAINTENANCE 5If particles are still suspected to be in the muffler, drive the machine onto the incline so the front of the machine is one foot higher than the rearSet the hand brake and block the wheelsMake sure the machine is in neutral and repeat Steps and 3SEE PREVIOUS WARNING 6Repeat Steps through until no more particles are expelled when the engine is revved7Stop the engine and allow the arrestor to cool8Reinstall the clean out plugs
BRAKE PAD INSPECTION
364 (.1cm) Minimum Thickness
BRAKE SYSTEM INSPECTION
The following checks are recommended to keep the brake system in good operating conditionService life of brake system components depends on operating conditionsInspect brakes in accordance with the maintenance schedule and before each rideG Keep fluid level in the master cylinder reservoir to the indicated level inside reservoirUse Polaris DOT Brake Fluid (PN 2870990)
Pads should be changed when friction material is worn to 364 (.1 cm), or about the thickness of dime