Polaris ATP 330 4x4 - Manual (Page 94)

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MAINTENANCE AND LUBRICATION
Adjustments
Auxiliary Brake
The auxiliary brake is a hydraulic disc brake. The rear brake system is
self-adjusting and requires no maintenance other than periodic checks
of the pads for wear.
Change the brake pads when they’re worn to 3/64″ (.1 cm).
Inspect the brake disc spline and pad wear surface for excessive wear.
Your vehicle’s auxiliary brake system is intended to be used as a
backup for the main brake system. Should the main system fail, the
rear brake can be activated by depressing the foot pedal on the inside of
the right footrest.
NOTE: Since the auxiliary brake is a rear brake only, it will not be as
effective for braking as the all-wheel single lever system.