Brake Fluid: Description and Operation

HYDRAULIC FLUID
Brake fluid should meet the DOT-3 specification. Use DOT-4 fluid for heavy duty applications such as trailer towing or mountain driving. Use only clean fluid from a sealed container. Fluid exposed to air will absorb moisture from the air. Water in the brake fluid will cause the fluid to boil, and the rubber components to deteriorate.
Thoroughly clean the master cylinder reservoir cap before removing it. Do not let any dirt or foreign material fall into the fluid reservoir.
There is a fluid level switch in the master cylinder reservoir. When the fluid level is low, the BRAKE lamp in the instrument cluster will turn on. The correct brake fluid level is marked on the driver's side of the master cylinder reservoir. If the fluid level is below the MIN indicator mark, check the hydraulic brake system for leaks and then refill the reservoir to the MAX indicator mark.