Fog Lamps
Fog lamps are designed to reduce glare in foggy
conditions. The marker lamps or headlights must be
on in order to turn the LED fog lamps on. Pull the
headlight switch out to activate them.
Utility Lamps
Utility lamps can be flush-mounted on the back of the
cab and swivel-mounted on the side extenders.
Press the upper half of the switch, as shown in
to turn the utility lamps on or off.
When the utility lamps are on, a red indicator light in
the utility light switch is illuminated.
Pretrip Light Test
The pretrip light test allows the driver to walk around
the vehicle to verify all exterior lights are working
properly. A pretrip light test switch exists on both the
key fob and the dash, shown in
Pressing either switch causes the vehicle’s exterior
lights to come on and go off in a set sequence.
Pressing either switch again, stops the sequence.
Dash-Mounted Brake Controls
NOTE: See
Brake Systems for
detailed information about brake systems.
Parking Brake Control Valve
The yellow diamond-shaped knob operates the
parking brake valve. See
. Pull the knob out
to apply both the tractor and the trailer spring parking
brakes. Push both the parking brake and the trailer
air supply knobs in to release the tractor and trailer
spring parking brakes. Before the spring parking
brakes can be released, the air pressure in either air
brake system must be at least 65 psi (448 kPa).
If the trailer is not equipped with spring parking
brakes, pull the parking brake valve out to apply the
tractor parking brakes and the trailer service brakes.
Trailer Air Supply Valve
The red octagonal-shaped knob operates the trailer
air supply valve, which charges the trailer air supply
system and releases the trailer spring parking
brakes. See
After the vehicle and its air hoses are connected to a
trailer and the pressure in the air system is at least
65 psi (448 kPa), push the trailer air supply valve
knob in (and leave it in) to charge the trailer air
supply system and release the trailer spring parking
brakes. Pull the trailer air supply valve out before
disconnecting a trailer or when operating a vehicle
without a trailer.
Trailer Brake Lever
The trailer brake lever, shown in
is used to
apply the trailer service brakes without applying the
truck or tractor service brakes. Move the lever down
to apply the trailer brakes; move the lever up to
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UTLY
LIGHT
Fig. 4.10, Utility Light Dash Switch
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LIGHT
TEST
Fig. 4.11, Pretrip Light Test Dash Switch
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1
2
1.
Trailer Air Supply Valve (red knob)
2.
Parking Brake Control Valve (yellow knob)
Fig. 4.12, Brake Valve Control Knobs
Driver Controls
4.5
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