Polaris 2003 Frontier - Manual (Page 97)

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MAINTENANCE
General Maintenance
Brake Fluid
All DOT 3 brake fluid is not the same. We recommend the use of only
Polaris DOT 3 high temperature brake fluid. See page 128 for the part
numbers of Polaris-recommended products.
The brake fluid level can be seen through a plastic sight glass in the
brake reservoir. If the fluid is sufficient, the sight glass will be black.
If the sight glass is any color other than black, add brake fluid.
Maintain the brake fluid level between the MIN and MAX marks on
the master cylinder reservoir.
After opening a bottle of brake fluid, always discard any
unused portion. Never store or use a partial bottle. Brake
fluid is hygroscopic, meaning it rapidly absorbs moisture from
the air. The moisture causes the boiling temperature of the
brake fluid to drop, which can lead to early brake fade and the
possibility of accident or severe injury.
WARNING
Keep the master cylinder cover free of dirt and debris. The vent
slits allow for diaphragm movement, and if they become
plugged, movement of brake fluid below the diaphragm may be
restricted, altering brake function.
WARNING
Brake fluid will damage decals, paint and some plastics. Always
wipe up spills immediately.
CAUTION