234
Driving
The engine brake is primarily intended for prolonged braking, for example when
decelerating from high speed on a level road or when driving downhill. This reduces
service brake wear.
NOTE: The engine cannot be switched off with the engine brake.
Brake effect
The engine brake has the greatest braking performance in the engine speed range
in the blue area of the rev counter. The braking performance decreases as the engine
speed falls.
CAUTION:
– Do not operate the engine in the red area of the rev counter.
Exceeding the permitted engine speed may seriously damage the
engine.
Vehicle with manual gearbox
When using the engine brake, adjust the gear selection so that the engine speed
remains in the blue area of the rev counter.
The braking performance decreases as the engine speed decreases.
Vehicle with an automated gearbox
When operating the engine brake in the fully automatic mode or the automatic mode
with the Eco Mode function switched off, the automated gearbox tries to keep the
engine speed in the blue area of the rev counter.
In the manual mode, the automated gearbox does not automatically shift down to the
ideal speed range for the engine brake when the engine brake is operated. When using
the engine brake, adjust the gear selection so that the engine speed remains in the blue
area of the rev counter.
NOTE: The engine brake does not function when the automated gearbox
changes from one gear to another. The vehicle may accelerate when driving
downhill.
CAUTION: The vehicle speed may increase when travelling downhill.
In fully automatic mode or automatic mode with the Eco Mode function
switched off, the automated gearbox selects a higher gear to protect
the engine against excessive engine speed. If the gearbox is in manual
mode, the engine speed can exceed the maximum permitted engine
speed. This can lead to serious damage to the engine.
– With the gearbox in manual mode, select a higher gear to prevent
the engine from exceeding the maximum engine speed (red area of
the rev counter).
DW63246305.book Page 234 Friday, March 22, 2019 4:54 PM
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