Checking Brake Fluid - GMC Envoy Owner's Manual

So, it is not a good idea to top off your brake fluid.
Adding brake fluid will not correct a leak. If you add fluid
when your linings are worn, then you will have too
much fluid when you get new brake linings. You should
add or remove brake fluid, as necessary, only when
work is done on the brake hydraulic system.
CAUTION:
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If you have too much brake fluid, it can spill on
the engine. The fluid will burn if the engine is
hot enough. You or others could be burned,
and your vehicle could be damaged. Add brake
fluid only when work is done on the brake
hydraulic system. See "Checking Brake Fluid"
in this section.
Refer to the Maintenance Schedule to determine when
to check your brake fluid. See Scheduled Maintenance
on page 6-4.
5-38

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.
Look at the brake fluid
reservoir. The fluid level
should be above MIN. If it
is not, have your brake
system checked to
see if there is a leak.