2010 Polaris Sportsman 850 Service Manual, Page 304Get this manual

2010 Polaris Sportsman 850 Service Manual, Page 304

BRAKES HYDRAULIC BRAKE SYSTEM OPERATION The brake system consists of the following components or assemblies: hand brake master
within the caliper moves further outward and becomes self adjustingFluid from the reservoir fills the additional area created
when the caliper piston moves outwardBrake fluid level is critical to proper system operationToo little fluid will allow
air to enter the system and cause the brakes to feel spongyToo much fluid could cause brakes to drag due to fluid expansionLocated
within the master cylinder is the compensating port which is opened and closed by the master cylinder piston assemblyAs the
temperature within the hydraulic system changes, this port compensates for fluid expansion or contractionDue to the high
temperatures created within the system during heavy braking, it is very important that the master cylinder reservoir have
adequate space to allow for fluid expansionNever overfill the reservoir! Do not fill the reservoir beyond the MAX LEVEL line!