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initiates partial braking of the vehicle. If you do
not react to the partial brake application, Active
Brake Assist automatically initiates an emergency
braking manoeuvre.
Active Brake Assist can have the following
effects:
ideally avoid a collision with the vehicle in
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front
minimise the danger of a collision with the
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vehicle in front or a stationary obstacle in the
path of your vehicle
reduce the consequences of a collision with
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the vehicle in front
Within the system limits, Active Brake Assist 5
can also have the following effects:
react to moving people with partial brake
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application and maximum full-stop braking
react earlier to an obstacle in the path of your
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vehicle
also at high speeds, avoid a collision with the
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vehicle in front or avoid an obstacle in the
path of your vehicle
System limits
Active Brake Assist may be impaired or may not
function in the following situations:
if visibility is poor, e.g. due to snow, rain, fog
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or heavy spray
if the carriageway is very narrow and winding
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if the radar sensor is impaired due to interfer‐
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ence from other radar sources, such as
strong radar reflections in car washes
Active Brake Assist 5 may also be impaired or
may not function in the following situations:
if there is glare, e.g. from oncoming traffic,
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direct sunlight or reflections (e.g. if the carria‐
geway is wet)
if the windscreen in the area of the camera is
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dirty, obscured or damaged, e.g. due to a
faulty windscreen wiper or a sticker
In some circumstances, Active Brake Assist does
not react correctly in the following situations:
if vehicles move quickly into the sensor detec‐
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tion range
on bends with tight radii
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In some circumstances, Active Brake Assist 5
does not react correctly in the following situa‐
tions:
to stationary people
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to pedestrians that are obscured by other
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objects
if the typical contour of a pedestrian does not
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stand out from the background
if a pedestrian is no longer detected as such,
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e.g. due to special clothing or other objects
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 5 can only react to pedes‐
trians up to a speed of 50 km/h.
Important safety notes
& WARNING Risk of a collision despite
Active Brake Assist
Active Brake Assist will initially brake your
vehicle with a partial application of the brakes
if a danger of a collision is detected. A colli‐
sion can result unless you also apply the
brakes yourself.
Automatic maximum full-stop braking cannot
always prevent a collision.
Always apply the brakes yourself and try
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to take evasive action.
& WARNING Risk of an accident as a result
of limited perceptibility of road users and
traffic situations with Active Brake Assist
Active Brake Assist cannot always recognise
other road users and complex traffic condi‐
tions.
In such cases, Active Brake Assist may:
give an unnecessary warning and then
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brake the vehicle
neither give a warning nor intervene
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Drive on with care and be ready to
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brake, in particular if Active Brake Assist
issues a warning.
Driving mode 245
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