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risk persists, Active Brake Assist automatically
initiates partial braking of the vehicle. If you do
not react to the partial brake application, Active
Brake Assist automatically initiates an emer-
gency braking manoeuvre.
Active Brake Assist assists you:
in ideally avoiding a collision with the vehicle
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in front
in minimising the danger of a collision with the
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vehicle in front or a stationary obstacle in the
path of your vehicle
in reducing the consequences of a collision
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with the vehicle in front
Within the system boundaries, Active Brake
Assist can:
react earlier to an obstacle in the path of your
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vehicle
react to moving people with a warning and
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partial brake application
perform an emergency braking manoeuvre at
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higher speeds as a full brake application to
bring the vehicle to a standstill
If you fail to adapt your driving style or if you are
inattentive, Active Brake Assist can neither
reduce the risk of an accident nor override the
laws of physics.
You are responsible for keeping a safe distance
to the vehicle in front, for the vehicle speed,
braking in good time and remaining in lane. You
should always adapt your driving style to suit
prevailing road and weather conditions.
Brake the vehicle using the service brake if:
a red event window with the · symbol
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appears in the on-board computer
an intermittent warning tone sounds
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an intermittent warning tone sounds and
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automatic partial braking was initiated
Active Brake Assist may not detect narrow vehi-
cles driving in front, e.g. motorcycles or vehicles
driving on a different line.
Read the safety notes on driving conditions that
may lead to system restrictions (
The system may not react correctly:
to stationary people
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to people or vehicles moving quickly within
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the detection range of the sensors
to people in a tunnel
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Active Brake Assist may unexpectedly issue
warnings or brake your vehicle:
in car washes
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to stationary obstacles inside a tunnel
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on ferries
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in loading areas
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at tollgates
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in workshops
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If no visual and/or acoustic warning is issued in
a critical situation:
Active Brake Assist has not recognised the
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danger of the situation
Active Brake Assist is deactivated
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Active Brake Assist has failed
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If a visual and/or acoustic warning is issued or a
partial braking manoeuvre is performed in a
non-critical situation:
suppress Active Brake Assist or
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press the l button to deactivate Active
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Brake Assist
You can suppress or deactivate Active Brake
Assist if you:
use a turn signal
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depress the accelerator pedal
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press the Active Brake Assist OFF button
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You can cancel an emergency braking manoeu-
vre triggered by Active Brake Assist, if you:
depress the accelerator pedal beyond the
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pressure point (kickdown)
or press the Active Brake Assist OFF button
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Clean the cover of the Active Brake Assist dis-
tance sensor regularly (
If the distance sensor cover is dirty or icy, its
functionality may be impaired.
Do not mount any attachments in front of the
distance sensor, e.g. a crash guard, and do not
paint or affix items to the sensor cover. Other-
wise, the operation of the distance sensor and
the operation of Active Brake Assist may be
affected.
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page 287).
Driving systems
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page 352).
285
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