2007 Polaris Two Stroke Snowmobile Workshop Repair manual, Page 188Get this manual
FINAL DRIVEBRAKES HYDRAULIC BRAKE SYSTEM
allow for the air above the fluid to equalize pressure as the fluid expands or contractsBe sure the vent is open and allowed to functionIf the reservoir is overfilled or the diaphragm vent is plugged, the expanding fluid may build pressure in the brake system and lead to brake failure
General Guidelines WARNING