2008 Cadillac STS Owner's Manual - Page 360

What to Add When you do need brake fluid, DOT-3 brake fluid is recommended for use. DOT-4 brake fluid is also compatible with your vehicle's brake system parts. However, if you choose to use DOT-4 fluid, it is recommended that you flush the brake hydraulic system and refill it 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 you spill brake fluid on your vehicle's painted surfaces, the paint finish can be damaged. Be careful not to spill brake fluid on your vehicle. If you do, wash it off immediately. See Washing Your Vehicle on page 5-110. {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. 5-42