2011 Cadillac DTS Owner's Manual - Page 335

Notice: . Brakes Brake Fluid The brake master cylinder reservoir is filled with DOT 3 brake fluid. See Engine Compartment Overview on page 6 ‑ 14 for reservoir location and access. 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 the washer fluid tank and other parts of the washer system. Also, water does not clean as well as 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. Do not use engine coolant (antifreeze) in the windshield washer. It can damage the windshield washer system and paint. . . . There are only two reasons why the brake fluid level in the reservoir might go down: . The brake fluid level goes down because of normal brake lining wear. When new linings are installed, the fluid level goes back up. 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. . 6-33