
PART 4: CONTROLS AND DISPLAYS
DASH-MOUNTED FEATURES
(R05/10)
Y53-6032
– 49 –
will prompt you to press the service brake pedal if it has
not been pressed since the vehicle has been started.
Engine Brake
When an engine brake is energized, the power-producing
diesel engine is converted into a power-absorbing air
compressor to retard the vehicle.
• The brake is energized whenever the driver’s foot is
completely removed from the accelerator pedal.
• The brake is deenergized during driving by pressure
on the accelerator pedal, and during shifting by
depressing the clutch pedal.
The ON/OFF toggle switch turns the system ON or OFF.
• In PACCAR, Caterpillar- and Cummins-powered vehi-
cles equipped with a Jacobs Engine Brake, a second
two- or three-mode switch is incorporated in the
instrument panel. With this system, you can select
either LOW or HIGH or LOW/MEDIUM/HIGH retard-
ing.
For more information on when and how to use the engine
brake in your vehicle, see the Engine owner’s manual for
the engine brake.
Y53-6032.book Page 49 Monday, May 24, 2010 3:37 PM
Summary of Contents for Peterbilt 587
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