Navistar WorkStar Series, Operator'S Manual

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Operation
NOTE: When attempting to readjust/slide the position of the
tractor fifth wheel or the trailer’s tandem axles with the tractor
and trailer fully connected, leave the tractor’s PARKING BRAKE
pushed in and pull the TRAILER AIR SUPPLY out. This will
apply the trailer’s parking brakes and keep it stationary while
the tractor is moved forward or reverse.
Parking Brake Indicator
WARNING
Driving with the parking brakes applied can lead
to excessive heat build up and fire resulting in
property damage, personal injury, or death.
The parking brake indicator is operated in conjunction with the
parking brake. With the ignition switch on and the parking brake
set, the PARK indicator will illuminate.
If the indicator does
not illuminate with the parking brake set, the indicator may be
inoperative.
Parking Brake Alarm
The parking brake alarm is used to alert drivers when they have
failed to set the parking brake when exiting the vehicle. The
alarm is a continuous sounding of the electric (city) horn. The
conditions that allow this to occur are:
1. The ignition switch is in the OFF position.
2. The parking brake is not set.
3. The driver’s door (any cab) is opened.
To turn off the alarm, press the service brake pedal. Then, after
turning the ignition switch to the RUN or ACC position, make
sure that the parking brake is set.
Antilock Brake System (ABS)
WARNING
Antilock brake systems are designed to enhance
overall vehicle safety when a vehicle is driven
within its safe operating limits.
ABS cannot
compensate for a vehicle that is being driven
beyond the physical limits of control.
Drivers
operating an ABS equipped vehicle should
employ safe driving practices and assume no
additional driving risks. Failure to do so could
result in property damage, personal injury, or
death.
WARNING
Do not rely on the ABS system to interrupt vehicle
retarder, engine brake on slippery road surfaces.
Turn these devices off during hazardous driving
conditions. Failure to follow this warning may
cause wheel slippage and/or loss of vehicle
control, which could result in property damage,
personal injury, or death.
The antilock brake system is a mandated feature added to the
standard air brake system.
It electronically monitors vehicle
wheel speed at all times, and only engages when wheel lock
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