Cadillac 2008 STS, Owner'S Manual, Page: 360 / 500

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.
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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.
•
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.
5-42