GMC 2003 Safari Owner's Manual page 261

Notice: 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 Part D: Recommended Fluids
and
Lubricants
on
page 6-32.
Always clean the brake fluid reservoir cap and the area
around the cap before removing it. This will help keep dirt
from enteri the reservoir.
With the wrong kind of fluid in your brake
system, your brakes may not work well, or they
may not even work at all. This could cause a
crash. Always use the proper brake fluid.
I
Using the wrong fluid can badly damage brake
system parts. For example, just a few drops of
mineral-based oil, such as engine oil, in your
brake system can damage brake system
parts so badly that they'll have to be replaced.
Don't 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 "Appearance Care" in the Index.
5-44