Checking Brake Fluid - GMC 2014 Sierra Owner's Manual

change in many other ways if the
wrong replacement brake parts are
installed.
The brake master cylinder reservoir
is filled with DOT 3 brake fluid. See
for the location of the
reservoir.
There are only two reasons why the
brake fluid level in the reservoir
might go down:
The brake fluid level goes down
because of normal brake lining
wear. When new linings are
installed, the fluid level goes
back up.
A fluid leak in the brake
hydraulic system can also cause
a low fluid level. Have the brake
hydraulic system fixed, since a
leak means that sooner or later
the brakes will not work well.
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. See Checking Brake
Fluid in this section.
When the brake fluid falls to a low
level, the brake warning light comes
on. See
.
Refer to the Maintenance Schedule
to determine when to check the
brake fluid. See
.
Check brake fluid by looking at the
brake fluid reservoir. See
.