Brake Master Cylinder - GMC 1999 Sierra 1500 Pickup Owner's Manual

Brake Master Cylinder
Your brake master cylinder is here. It is filled with DOT-3 brake fluid.
K2470
There are only two reasons why the brake fluid level in your master cylinder
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 your brake system fixed, since a leak means
that sooner or later your brakes won't work well, or won't work at all. So, it
isn't a good idea to "top off" your brake fluid. Adding brake fluid won't correct
a leak. If you add fluid when your linings are worn, then you'll 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
I
If
you have too much brake fluid,
it
can spill on the engine. The fluid
and your vehicle could be damaged. Add
.
ake
fhid nnlv
en wn
is
done on the brake hydraulic system.
-\
will burn if the engine is hot enough. You or others could
he
burned
Refer to the Maintenance Schedule to determine when to check your brake
fluid. See "Periodic Maintenance" in the index.
To Check Brake Fluid:
You can check the brake fluid without taking off the cap. Just look at the
windows on the brake fluid reservoir. The fluid levels should be above the
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