Polaris Trail Boss 330 Quadricycle - Manual (Page 76)

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MAINTENANCE AND LUBRICATION
Brakes
Under normal operation, a diaphragm extends into the reservoir as fluid
level drops. If the fluid level is low and the diaphragm is not extended,
a leak is likely. The brake system should be inspected by your dealer.
Fill the reservoir as needed whenever the cover is loosened or removed
to ensure proper diaphragm operation. Use Polaris DOT 3 brake fluid.
Do not overfill.
NOTE: Reservoir levels will decrease as brake pads become worn.
When checking the fluid level, the vehicle must be on level
ground with the handlebars straight. If the fluid level is low,
check brake pad thickness before adding brake fluid. DO
NOT OVERFILL.
Brake Check
Perform the following checks to keep the brake systems in good
operating condition. Check more often if brakes are used heavily
during normal operation.
WARNING
Do not overfill the reservoirs. An over-full master cylinder may
cause brake drag or brake lock-up, which could cause brake loss
or loss of control. Maintain brake fluid at the recommended level.
1. Check the brake systems regularly for
fluid leaks.
2. Check the brakes for excessive travel
or spongy feel.
3. Check the brake pads for wear,
damage or looseness. Replace pads
when they are worn to 1 mm.
4. Check the security and surface
condition of the brake discs.