2008 GMC Envoy Owner's Manual - Page 333

Checking Brake Fluid The brake fluid can be checked without taking off the cap by looking at the brake fluid reservoir. The fluid level should be above MIN. If it is not, have the brake hydraulic system checked to see if there is a leak. {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. 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. After work is done on the brake hydraulic system, make sure the level is above the MIN, but not over the MAX mark. • 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 5-103. What to Add When you do need brake fluid, use only DOT-3 brake fluid. Use new brake fluid from a sealed container only. See Recommended Fluids and Lubricants on page 6-12. Always clean the brake fluid reservoir cap and the area around the cap before removing it. This helps keep dirt from entering the reservoir. 5-39