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212 Driving mode
A system error occurs.
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The power supply is too low.
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Vehicles with automated manual trans‐
mission: after deactivation of the HOLD
function, the activated crawler mode does
not cause automatic crawling (
Continuous brake
Notes on the continuous brake
& WARNING Risk of skidding and/or acci‐
dent when using the continuous brake on
slippery road surfaces
If you activate the continuous brake or shift
to a lower gear on a slippery road surface in
order to increase the engine's braking effect,
the drive wheels may lose traction.
Do not activate the continuous brake
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and do not shift to a lower gear in order
to increase the engine's braking effect
on a slippery road surface.
& WARNING Risk of skidding and acci‐
dents in the event of a retarder malfunc‐
tion
In the event of a retarder or retarder control
malfunction, the handling and braking charac‐
teristics could change.
The vehicle could brake in an uncontrolled
way. The wheels could lock and thereby lose
traction. The vehicle could start to skid.
Acceleration of the vehicle could be slower
than desired while overtaking. Overtaking
takes longer and may have to be aborted.
Drive particularly carefully or stop in
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accordance with the traffic conditions.
Have the retarder checked and repaired
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immediately at a qualified specialist
workshop.
Always pay attention to the warning
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lamps and display messages and
observe the described corrective action.
The engine brake and retarder are used as a con‐
tinuous brake.
You can utilise the engine's braking effect, partic‐
ularly on long downhill gradients, if you observe
the following points:
activate the continuous brake
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shift to a lower gear in good time
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page 218).
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The continuous brake can be activated automati‐
cally in the following situations:
after several brake applications, the vehicle
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electronics detect that the vehicle is loaded
and you then depress the brake pedal
cruise control, limiter or distance control
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assistant intervene in overrun mode
Engine brake
The effectiveness of the engine brake depends on
the engine speed. A high engine speed results in
more effective engine braking. Observe the effec‐
tive engine braking range marked on the rev
counter (
peratures, the engine brake has limited or no
effect after the engine has been started.
Retarder
If the à indicator lamp flashes in the instru‐
ment cluster, the retarder's braking power is
reduced. Shift to a lower gear in good time to
increase the engine braking effect and engine
cooling.
Activating/deactivating the continuous brake
If the continuous brake is deactivated and the
à indicator lamp in the instrument cluster
does not go out, have the continuous brake
checked at a qualified specialist workshop.
Example: multifunction lever
®
BlueTec
ped with three brake stages (1 –3) and vehi‐
/
page 116). At very low outside tem‐
vehicles without a retarder are equip‐
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