Chevrolet 4500 HD 2023 Manual page 56

Brake System Warning Light
If the light remains on after engine start up
or comes on during operation of the vehicle,
it means that there is something wrong
with part of the brake system.
The brake system warning light comes on
while the engine is running (after startup) in
the following situations:
Drop in the level of brake fluid (due to
brake pad wear or fluid leakage).
Abnormality in the charging system (such
as an alternator malfunction or loose or
split fan belt).
Abnormality in the anti-lock brake system
(ABS) and Electronic Braking force
Distribution (EBD) functions. (The ABS
warning light and brake system warning
light will illuminate at the same time.)
See Antilock Brake System (ABS) Warning
Light 0 57.
To serve as a reminder, the light should stay
on when the parking brake is not fully
released, and the engine control switch is
on. Have the system repaired if the light
does not come on when it should. If this
warning light does not go away, brake
inspection and maintenance should be
performed.
Check and Corrective Action
1. Check to see that the parking brake has
been fully released. If it has, check the
following:
2. Turn on the exhaust brake to help slow
the vehicle.
3. Pull off the road and stop carefully.
Remember that stopping distances may
be longer, the pedal may be harder to
push, and the pedal may go down
farther than normal.
4. Check the brake fluid reservoir on the
left side of the instrument panel. If low,
add fluid as needed.
5. If the brake fluid is not low: Try out the
brakes by starting and stopping on the
shoulder of the road, then either drive
cautiously at a safe speed to the nearest
dealer for repair, if you judge driving to
be safe; or have the vehicle towed to the
Instruments and Controls
nearest dealer for repair. Continued
driving without the necessary repairs
could be dangerous.
If this warning light stays on, see your
dealer.
The regular braking system is a split system
designed so that one part will provide some
braking if there is a loss of hydraulic
pressure in the other part of the system.
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Warning
If this warning light comes on while the
engine is running, immediately stop the
vehicle at a safe place well clear of traffic
and contact your dealer for inspection.
When the brake system warning light is
illuminated, brake effectiveness may be
decreased. When this happens, strongly
press the brake pedal.
See Brakes 0 258.
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