workshop. This also applies to collisions at slow
speeds where there is no visible damage to the
front of the vehicle.
If you change wheel size, make sure they corre-
spond to the correct wheel size category
(
Y
page 355). If the category is changed without
recoding the control units in the vehicle, the
functioning of Adaptive Brake Assist may be
impaired. COLLISION PREVENTION ASSIST may
then detect a fault and switch itself off.
If Adaptive Brake Assist is not available due to a
malfunction in the radar sensor system, the
brake system remains available with full brake
boosting effect and BAS.
Function
With the help of the radar sensor system, Adap-
tive Brake Assist can detect obstacles that have
been in the path of your vehicle for an extended
period of time. Adaptive Brake Assist does not
react to stationary obstacles. If Adaptive Brake
Assist detects a risk of collision with a vehicle
travelling in front or with a stationary obstacle,
the system calculates the braking force neces-
sary to avoid a collision. If you apply the brakes
forcefully, Adaptive Brake Assist will automati-
cally increase the braking force to a level suita-
ble for the traffic conditions.
X
Brake until the distance to the obstacle
increases and the risk of a collision passes.
ABS prevents any of the wheels from locking.
The brakes function as usual again if:
R
you release the brake pedal
R
there is no longer any danger of a collision
R
no obstacle is detected in front of your vehicle
Braking assistance is then ended.
Vehicles with PRE-SAFE
®
: if Adaptive Brake
Assist demands particularly high braking force,
preventative passenger protection measures
are activated simultaneously. Information on
this can be found under "PRE-SAFE
®
"
(
Y
page 59).
Blind Spot Assist
General notes
Blind Spot Assist monitors the areas on either
side of the vehicle that are not visible to the
driver with two lateral, rear-facing radar sensors
in the bumper. It supports you from speeds of
approximately 30 km/h. A warning display in
the exterior mirrors draws your attention to
vehicles detected in the monitored area. If you
then switch on the corresponding turn signal to
change lane, you will also receive an optical and
audible collision warning.
Important safety notes
G
WARNING
Blind Spot Assist does not react to vehicles:
R
overtaken too closely on the side, placing
them in the blind spot area
R
when the difference in the speed of
approach and overtaking is too great
As a result, Blind Spot Assist cannot warn
drivers in these situations. There is a risk of an
accident.
Always pay careful attention to the traffic sit-
uation and maintain a safe distance at the side
of the vehicle.
Blind Spot Assist is only an aid. It may fail to
detect some vehicles and is no substitute for
attentive driving. Always ensure that there is
sufficient distance to the side for other road
users and obstacles.
In particular, the detection of obstacles can be
impaired in the case of:
R
dirt on the sensors or anything else covering
the sensors
R
fog, heavy rain or snow
R
narrow vehicles, e.g. motorcycles or bicycles
R
very wide lanes
R
narrow lanes
R
vehicles not driving in the middle of their lane
R
barriers or other road boundaries
Vehicles in the monitoring range are then not
indicated.
196
Driving systems
Driving and parking
