2009 Hummer H3T Owner's Manual - Page 266

5-30 Service and Appearance Care Notice: Windshield Washer Fluid What to Use When windshield washer fluid is needed, be sure to read the manufacturer's instructions before use. If operating the vehicle in an area where the temperature may fall below freezing, use a fluid that has sufficient protection against freezing. Brakes Brake Fluid • When using concentrated washer fluid, follow the manufacturer's instructions for adding water. • Do not mix water with ready-to-use washer fluid. Water can cause the solution to freeze and damage your washer fluid tank and other parts of the washer system. Also, water does not clean as well as washer fluid. The brake master cylinder reservoir is filled with DOT-3 brake fluid. See Engine Compartment Overview on page 5-10 for the location of the reservoir. There are only two reasons why the brake fluid level in the reservoir might go down: Adding Washer Fluid • Fill the washer fluid tank only three-quarters full when it is very cold. This allows for fluid expansion if freezing occurs, which could damage the tank if it is completely full. Open the cap with the washer symbol on it. Add washer fluid until the tank is full. See Engine Compartment Overview on page 5-10 for reservoir location. • The brake fluid level goes down because of normal brake lining wear. When new linings are installed, the fluid level goes back up. • Do not use engine coolant (antifreeze) in your windshield washer. It can damage the vehicle's windshield washer system and paint. • A fluid leak in the brake hydraulic system can also cause a low fluid level. Have the brake hydraulic system fixed, since a leak means that sooner or later the brakes will not work well.