PART 4: CONTROLS AND DISPLAYS
PB1319 (CAT. NO. 5296 ) —31— 22-01691 (R02/02)
If your vehicle is a tractor, a red, octagonal-shaped knob will be next
to the parking brake valve on the right-hand control panel. This is the
trailer air supply valve for selecting operation with or without a trailer.
Two-Valve System
• To apply all parking brakes, pull the yellow, or parking brake, knob
out. The truck or tractor parking brakes will set. If equipped, the
Trailer Air Supply Valve (red octagonal knob) will automatically trip
(“pop out”) and set the trailer parking brakes.
• To release truck parking brakes, push in the yellow knob. If a trac-
tor with trailer, push in both the yellow and the red knobs.
For full information on parking brakes, see the Index, under Brake
.
Heating And Air Conditioning Controls
WARNING! Stopping with the parking brake controls
can cause a sudden wheel lock-up, loss of control, or
can cause you to be overtaken by following vehicles.
You could be severely injured. Never pull out the park-
ing brake valve while the vehicle is moving.
WARNING! Exhaust fumes from the engine contain carbon
monoxide, a colorless and odorless gas. Do not breathe the
engine exhaust gas. A poorly maintained, damaged or cor-
roded exhaust system can allow carbon monoxide to enter
the cab. Entry of carbon monoxide into the cab is also possi-
ble from other vehicles nearby. Failure to properly maintain
your vehicle could cause carbon monoxide to enter the cab/
sleeper and causes serious illness.
CAUTION: Never idle your vehicle for prolonged periods of
time if you sense that exhaust fumes are entering the cab .
Investigate the cause of the fumes and correct it as soon
as possible. If the vehicle must be driven under these con-
ditions, drive only with the windows slightly open. Failure
to repair the source of the exhaust fumes may lead to per-
sonal harm.
02909
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