Navistar WorkStar Series, Руководство оператора

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Operation
brake pedal quickly to apply a higher [above 40 psi (276 kPa)]
braking level, the driver’s braking input overrides the temporary
change made by the system.
ABS/Stability System Interaction: With the ABS–based
stability control system, the ABS system is given priority at the
wheel ends to manage wheel slip for optimal braking. The ABS
system functions similarly whether the stability system or the
driver applies the brakes.
Bobtail Proportioning System
Bobtail proportioning is available with tractor air brake systems
(for export only with code 04092) with or without ABS or
ABS/systems.
The proportioning valve senses when trailer
brakes are not connected to the vehicle air brake system
and automatically adjusts braking power when operating
in the bobtail mode, then returns full braking power when
a trailer is attached.
When operating in the bobtail mode,
bobtail proportioning provides more braking control and shorter
stopping distances, particularly on wet and slippery road
surfaces.
It should be noted that there is a noticeably different brake pedal
feel on tractors with this feature while operating in the bobtail
mode. Higher brake pedal efforts will be experienced by the
driver than in a brake system without bobtail proportioning.
Towing Instructions
WARNING
This vehicle may be equipped with (optional)
dual tow hooks for recovery purposes only.
Always use both tow hooks to prevent possible
overloading and breaking of individual hooks.
Failure to follow this warning could result in
property damage, personal injury, or death.
WARNING
Failure to comply with the following may result in
property damage, personal injury, or death:
• Always chock the wheels when manually releasing the
parking brakes, or the vehicle can roll.
• For towing, make sure the vehicle is securely connected
to tow vehicle and tow vehicle parking brakes are
applied before releasing the disabled vehicle’s parking
brakes.
• To ensure release of parking brake, always cage the
spring in the brake chamber.
• Under no circumstances should the spring brake
chamber be disassembled for the purpose of releasing
the parking brake.
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