Chevrolet 2009 Silverado 1500 Crew Cab Owner's Manual page 32

United States
This light should come on briefly when the ignition
key is turned to ON/RUN. If it does not come on then,
have it fixed so it will be ready to warn if there is a
problem.
3-6
Canada
If the light comes on while driving, pull off the road and
stop carefully. The pedal might be harder to push or
can go closer to the floor. It may take longer to stop.
If the light does not go out, have the vehicle towed for
service. See Towing Your Vehicle on page 4-2.
CAUTION:
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The brake system might not be working properly if
the brake system warning light is on. Driving with
the brake system warning light on can lead to a
crash. If the light is still on after the vehicle has
been pulled off the road and carefully stopped,
have the vehicle towed for service.