36 SAFETY INFORMATION
Operating in Bobtail Mode
CAUTION
When operating bobtail, be certain that
glad hands, trailer air hoses, electrical
cable and connectors are properly stowed
and secure. Do not allow them to rub or
chafe on other components.
Depending on customer specification, some tractors may be equipped with a bobtail air
brake proportioning valve which automatically redistributes the braking force between front
and rear axles when not hooked up to a semitrailer (bobtail operation).
When operating in bobtail mode, the rear brake chambers receive reduced or proportional
brake air pressure. When the tractor is towing a trailer, the rear brake chambers will receive
full (normal) brake pressure. For tractors with no proportioning valve, the ABS system
automatically controls brake pressure.
DANGER
Under no circumstances should the
published GVWR, FAWR, and/or RAWR
be exceeded. Failure to observe these
precautions can lead to the loss of vehicle
control, resulting in a vehicle accident
causing serious personal injury or death.
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