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Up to a speed of approximately 44 mph
(70 km/h), Brake Assist with cross-traffic
function may react to:
R
stationary objects in the path of your vehi-
cle, e.g. stopped or parked vehicles
R
pedestrians in the path of your vehicle
R
obstacles crossing your path which move in
the detection range of the sensors and are
detected
i
If Brake Assist with cross-traffic function
requires a particularly high braking force,
preventative passenger protection measures
(PRE-SAFE
®
) are activated at the same time
(Y page 55).
X
Keep the brake pedal depressed until the
emergency braking situation is over.
ABS prevents the wheels from locking.
Brake Assist with cross-traffic function is
deactivated and the brakes function as usual
again if:
R
you release the brake pedal
R
there is no longer a risk of collision
R
no obstacle is detected in front of your vehi-
cle
R
you depress the accelerator pedal
R
you activate kickdown
Active Brake Assist
General information
i
Observe the "Important safety notes" sec-
tion (Y page 60).
Active Brake Assist consists of a distance
warning function with an autonomous braking
function and Adaptive Brake Assist.
Active Brake Assist can help you to minimize
the risk of a collision with the vehicle in front
or reduce the effects of such a collision.
If Active Brake Assist detects that there is a
risk of collision, you will be warned visually
and acoustically. If you do not react to the vis-
ual collision warning or the warning tone,
autonomous braking can be initiated in critical
situations. If you apply the brake yourself in a
critical situation, Adaptive Brake Assist of the
Active Brake Assist system supports you.
Important safety notes
In particular, the detection of obstacles can be
impaired if:
R
there is dirt on the sensors or anything else
covering the sensors
R
there is snow or heavy rain
R
there is interference by other radar sources
R
there are strong radar reflections, for exam-
ple in parking garages
R
a narrow vehicle is traveling in front, e.g. a
motorbike
R
a vehicle is traveling in front on a different
line
R
you are driving a new vehicle or servicing on
the Active Brake Assist system has just
been carried out
Observe the important safety notes in the
"Breaking-in notes" section (Y page 125).
Following damage to the front end of the vehi-
cle, have the configuration and operation of
the radar sensor checked at a qualified spe-
cialist workshop. This also applies to collisions
at slow speeds where there is no visible dam-
age to the front of the vehicle.
Activating/deactivating
Active Brake Assist is automatically active
after switching on the ignition.
You can activate or deactivate Active Brake
Assist using the on-board computer
(Y page 198). When deactivated, the distance
warning function and the autonomous braking
function are also deactivated.
If Active Brake Assist is deactivated, the æ
symbol appears in the assistance graphic dis-
play.
Distance warning function
General information
The distance warning function can help you to
minimize the risk of a front-end collision with a
vehicle ahead or reduce the effects of such a
collision. If the distance warning function
detects that there is a risk of a collision, you
will be warned visually and acoustically.
Driving safety systems
63
Safety
Z
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