Use the dash-mounted switch set at the LO
position when driving on flat, open stretches of
road. If the service brakes are still required to
slow down on a grade, switch to a higher set-
ting on the dash switch, until there is no need
for the service brakes. Grade descent speed
should be such that the service brakes are
used infrequently and that they remain cool,
thus retaining their effectiveness.
•
For maximum retarding, maintain the top gov-
erned speed of the engine through the appro-
priate selection of gears. When shifting gears,
the engine brake will disengage when the
clutch pedal is depressed, then engage when
the clutch pedal is released.
•
To cancel the engine brake application, toggle
the ENG BRK switch OFF.
If the engine is equipped with both cruise control and
an engine brake, the engine brake can operate auto-
matically while in cruise control mode.
The engine brake will only operate when the accel-
erator pedal is fully released. Disengaging the clutch
will prevent the engine brake from operating.
Vehicles equipped with antilock braking systems
(ABS) have the ability to turn the engine brake off if
a wheel-slip condition is detected. The engine brake
will automatically turn itself back on once the wheel
slip is no longer detected.
Brake System
12.7
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