GMC 2007 Canyon - Manual (Page 350)

Brakes
Brake Fluid
The brake master
cylinder reservoir is
filled with DOT-3 brake
fluid. See Engine
Compartment Overview
on page 324 for the
location of the reservoir.
There are only two reasons why the brake fluid
level in the reservoir might go down. The first is that
the brake fluid goes down to an acceptable level
during normal brake lining wear. When new linings
are put in, the fluid level goes back up. The other
reason is that fluid is leaking out of the brake
system. If it is, you should have the brake system
fixed, since a leak means that sooner or later the
brakes will not work well, or will not work at all.
So, it is not a good idea to top off the 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:
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 437.
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