Paccar PX-9 Operator's Manual - page 29
OPERATING INSTRUCTIONS
WARNING!
DO NOT use an exhaust brake
when driving bobtail or with an un-
loaded trailer. There may not be
enough weight on the rear axle to
provide traction. This could cause
a loss of control and jackknife re-
sulting in an injury accident. Make
sure the exhaust brake is switched
“OFF” when bobtailing or with an
unloaded trailer. Failure to com-
ply may result in death, personal
injury, equipment or property dam-
age.
NOTE
When the engine (VGT) exhaust
brake switch is in the “ON” posi-
tion, the engine's electronic control
module (ECM) monitors inputs
(such as accelerator pedal position
and engine speed). From these in-
puts, the ECM determines when to
enable the engine (VGT) exhaust
brake feature when the proper
braking conditions are present.
Other features/switches like cruise
control, can also affect when the
engine (VGT) exhaust brake activates.
For more information on how the
engine (VGT) exhaust brake functions,
refer to vehicle operation manual or
contact a PACCAR Authorized Repair
Location.
WARNING!
To reduce the possibility of per-
sonal injury or property damage,
always be prepared to use the ve-
hicle service brakes for emergency
stopping. The safe control speed
of a vehicle will vary with the size
of the load, the type of load, the
grade, and the road conditions.
Failure to comply may result in
death, personal injury, equipment
or property damage.
NOTE
The exhaust brake can only be ac-
tivated when the accelerator pedal
is at its “low-idle” position. With the
throttle at “low-idle” position, fuel-
ing commands to the cylinders will
not detract from the braking power
of the brake system.
(12/2014)
Y53-1185-1B1
3-9
3