Cadillac 2012 CTS-V Owner's Manual page 349

Do not top off the brake fluid.
Adding fluid does not correct a leak.
If fluid is added when the linings are
worn, there will be too much fluid
when new brake linings are
installed. Add or remove brake fluid,
as necessary, only when work is
done on the brake hydraulic system.
If too much brake fluid is added, it
can spill on the engine and burn,
if the engine is hot enough.
You or others could be burned,
and the vehicle could be
damaged. Add brake fluid only
when work is done on the brake
hydraulic system.
When the brake fluid falls to a low
level, the brake warning light comes
on. See
.
Use only new DOT 3 brake
fluid from a sealed container.
See
Always clean the brake fluid
reservoir cap and the area around
the cap before removing it. This
helps keep dirt from entering the
reservoir.
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.
.