Polaris 2005 RMK - Manual (Page 91)

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MAINTENANCE
General Maintenance
Brake Fluid
WARNING
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.
CAUTION
Brake fluid will damage decals, paint and some plastics. Always
wipe up spills immediately.
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.
We recommend the use of Polaris DOT 3 high temperature brake fluid.
See page 112 for the part numbers of Polaris products.