Chevrolet Low Cab Forward 6.7L 2022 Owner's Manual page 176

Warning (Continued)
Driving under this condition may damage
the brake system or cause overheating
which may result in a fire.
If it was necessary to use the parking
brake during driving, be sure to check
afterwards to determine if any fault or
failure has resulted.
When you engage the parking brake lever,
brake air pressure is reduced at the rear
drive axle spring brake chambers to apply
the brakes.
Operation of Parking Brake
To set the parking brake, raise the parking
brake lever. The parking brake warning light
will then come on. Make sure that you hear
the air being released from the system. To
release the parking brake, lower the parking
brake lever while raising the release knob.
The parking brake warning light will then
go out.
The parking brake indicator light is designed
to remind you if the parking brake is not
released when the engine control switch
is on.
Driving and Operating
Caution
If the parking brake warning light
remains on when the parking brake lever
is lowered, a brake failure or a drop in air
pressure may be the cause.
Check the brake air pressure for correct
level. If the brake air pressure is low,
contact your local dealer.
Parking Brake Not Set Warning Light
When any of the doors are opened while
the parking brake is not applied, the parking
brake not set warning light will appear on
the display, and the warning buzzer will
sound.
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