GMC 2008 Yukon Denali Owner's Manual page 375

Checking Brake Fluid
The brake fluid can be checked without taking off the
cap by looking at the brake fluid reservoir.
After work is done on the brake hydraulic system,
make sure the level is above the MIN but not over
the MAX mark.
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.
The fluid level should be
above MIN. If it is not,
have the brake hydraulic
system checked to see if
there is a leak.
Always clean the brake fluid reservoir cap and the area
around the cap before removing it. This helps keep dirt
from entering the reservoir.
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 5-102.
5-37