2009 Cadillac STS-V Owner's Manual - Page 366

What to Add DOT-3 brake fluid is recommended. DOT-4 brake fluid is also compatible with the vehicle's brake system parts. However, if DOT-4 fluid is used, it is recommended that the brake hydraulic system be flushed and refilled with new DOT-4 fluid at a regular maintenance service every two years. See Additional Required Services on page 6-6. Use new brake fluid from a sealed container only. See Recommended Fluids and Lubricants on page 6-13. Always clean the brake fluid reservoir cap and the area around the cap before removing it. This helps keep dirt from entering the reservoir. Notice: • Using the wrong fluid can badly damage brake hydraulic system parts. For example, just a few drops of mineral-based oil, such as engine oil, in the brake hydraulic system can damage brake hydraulic system parts so badly that they will have to be replaced. Do not let someone put in the wrong kind of fluid. • If brake fluid is spilled on the vehicle's painted surfaces, the paint finish can be damaged. Be careful not to spill brake fluid on the vehicle. If you do, wash it off immediately. See Washing Your Vehicle on page 5-118. Brake Wear { CAUTION: With the wrong kind of fluid in the brake hydraulic system, the brakes might not work well. This could cause a crash. Always use the proper brake fluid. This vehicle has disc brakes. Disc brake pads have built-in wear indicators that make a high-pitched warning sound when the brake pads are worn and new pads are needed. The sound can come and go or be heard all the time the vehicle is moving, except when applying the brake pedal firmly. 5-40