Braking
Parking Brake Control Valve
The yellow diamond-shaped knob (
) on the
auxiliary dash panel operates the parking brake con-
trol valve (park brake switch). Pulling the yellow knob
applies the tractor parking brakes (spring brakes).
Pushing in the knob releases the tractor parking
brakes. Before the parking brakes can be released,
the air pressure in either air brake system must be at
least 65 psi (448 kPa).
See
under the heading "Dual Air Brake
System" for further information about the parking
brake control valve.
Trailer Air Supply Valve
The red octagonal-shaped knob (
) on the
auxiliary dash panel operates the trailer air supply
valve. After the vehicle and its air hoses are con-
nected to a trailer, and the pressure in the air system
is at least 65 psi (448 kPa), the red knob must be
pushed in (and should stay in) to charge the trailer
air supply system and release the trailer spring park-
ing brakes. Before disconnecting a trailer or when
operating a vehicle without a trailer, the red knob
must be pulled out.
See
under the heading "Dual Air Brake
System" for further information about the trailer air
supply valve.
Trailer Brake Lever
The trailer brake lever (hand control valve) is used
for applying the trailer brakes without applying the
truck or tractor brakes. It is usually mounted on the
right-hand control panel. See
. See
under the heading "Dual Air Brake System" for
operating instructions.
Meritor
™
WABCO® Antilock Braking
System (ABS)
The Meritor WABCO Antilock Braking System (ABS)
has an amber tractor indicator light (TRACTOR ABS
legend) and, if equipped with automatic traction con-
trol (ATC), an amber wheel spin indicator light
(WHEEL SPIN legend). See
On vehicles equipped with a compatible trailer, there
is also an amber trailer indicator light (TRAILER ABS
legend).
See the brake system operating instructions in
for more information about ABS.
Adjustable Steering Column
To tilt the steering column, press down on the foot
pedal located below the steering column. Tilt the
steering column up or down to the desired position.
1
f610808
LO
RANGE
HIGH
RANGE
LO
RANGE
HIGH
N−TRL
01/06/2015
2
1.
Two-Position Switch
2.
Three-Position Switch
Fig. 4.28, Transfer Case Range Switches
f610291
02/02/2017
1
2
1.
Trailer Air Supply Valve (red knob)
2.
Parking Brake Control Valve (yellow knob)
Fig. 4.29, Brake Valve Control Knobs
f610591
02/03/2017
Fig. 4.30, Trailer Brake Lever
Controls
4.12
