You are responsible for keeping a safe dis-
tance 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 condi-
tions.
Brake the vehicle using the service brake if:
R
a red event window with the
·
symbol
appears in the on-board computer
R
an intermittent warning tone sounds
R
an intermittent warning tone sounds and
automatic partial braking was initiated
The following may not be detected by Active
Brake Assist:
R
narrow vehicles, e.g. motorcycles
R
vehicles driving on a different line
Read the safety notes on driving conditions
that may lead to system restrictions
(
Y
page 131).
Vehicles with Active Brake Assist 4: the sys-
tem may not react correctly:
R
to stationary people
R
to people or vehicles moving quickly within
the detection range of the sensors
R
to people in a tunnel
Active Brake Assist may unexpectedly issue
warnings or brake your vehicle:
R
in car washes
R
to stationary obstacles inside a tunnel
R
on ferries
R
in loading areas
R
at tollgates
R
in workshops
If no visual and/or acoustic warning is issued
in a critical situation:
R
Active Brake Assist has not recognised the
danger of the situation
R
Active Brake Assist is deactivated
R
Active Brake Assist has failed
If a visual and/or acoustic warning is issued or
a partial braking manoeuvre is performed in a
non-critical situation:
R
suppress Active Brake Assist or
R
press the
l
button to deactivate Active
Brake Assist
You can suppress or deactivate Active Brake
Assist if you:
R
use a turn signal
R
depress the accelerator pedal
R
press the
l
button
i
Vehicles with Active Brake Assist 4: inter-
ventions of the system triggered by the
driver cannot be suppressed by switching on
the turn signal.
You can cancel an emergency braking
manoeuvre triggered by Active Brake Assist, if
you:
R
depress the accelerator pedal beyond the
pressure point (kickdown)
R
press the
l
button
Clean the cover of the Active Brake Assist dis-
tance sensor regularly (
Y
page 157).
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.
Activating and deactivating Active Brake
Assist
When you start the engine, Active Brake Assist
is automatically activated.
Active Brake Assist is deactivated automati-
cally if:
R
there is a malfunction
R
ABS is deactivated or there is a malfunction
in the brake system of the vehicle
Driving systems
129
Driving
mod
e
Z
