Chevrolet 1998 C/K Full-Size Pickup Owner's Manual page 152

If the warning light comes on, there could be a brake
problem. Have your brake system inspected right away.
I
BRAKE
This
light should come on
briefly when you turn the
ignition key to RUN. If it
doesn't come on then, have it
fixed
so
it will be ready to
warn you if there's a problem.
If the light comes on while you are driving, pull off the
road and stop carefully. You may notice that the pedal is
harder to push. Or, the pedal may go closer to the floor.
It
may take longer
to
stop. If the light is still
on,
have the
vehicle towed for service. (See "Towing Your Vehicle"
in the Index.)
A
CAUTION:
Your brake system may not be working properly
if the brake system warning light is on. Driving
with the brake system warning light on can lead
to an accident. If the light is still on after you've
pulled off the road and stopped carefully, have
the vehicle towed for service.
Anti-Lock Brake System Warning Light
With the anti-lock brake
system, this light will
come on when you start
ANTI
-
LOCK
your engine and may stay
on for several seconds.
That's normal.
2-68