Chevrolet Silverado Classic 2007 Owner's Manual page 518

Checking Brake Fluid
You can check the brake fluid without taking off
the cap.
After work is done on the brake hydraulic system,
make sure the level is above the MIN but not
over the MAX mark.
518
Just look at the brake
fluid reservoir. The fluid
level should be above
MIN. If it is not, have the
brake system checked to
see if there is a leak.
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 630.
Always clean the brake fluid reservoir cap and the
area around the cap before removing it. This
will help keep dirt from entering the reservoir.
CAUTION:
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With the wrong kind of fluid in the brake
system, the brakes may not work well.
This could cause a crash. Always use the
proper brake fluid.