Cadillac 2007 Escalade Owner's Manual page 430

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.
When the brake fluid falls to a low level, the
brake warning light will come on. See Brake
System Warning Light on page 228.
430
Refer to the Maintenance Schedule to determine
when to check your brake fluid. See Scheduled
Maintenance on page 517.
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.