Mercedes-Benz E-Class 2009 Owner's Manual page 60

period of time. If you approach an obstacle
®
and PRE-SAFE Brake detects a risk of a col-
lision, the system will initially alert you both
visually and acoustically. If you do not brake
or steer, the vehicle will at first automatically
brake slightly. In the event of an increased
risk of a collision, PRE-SAFE
( page 40). If the risk of collision persists and
Y
you do not brake, manoeuvre or accelerate
significantly yourself, an automatic full brake
application may be carried out.
G Risk of accident
Only clearly detected obstacles will trigger a
warning and initiate braking assistance by
®
PRE-SAFE Brake.
In particular, the detection of obstacles can
be impaired if there is:
dirt on the sensors or the sensors are cov-
R
ered
snow or heavy rain
R
interference by other radar sources
R
the possibility of strong radar reflections,
R
for example in multi-storey car parks
®
PRE-SAFE Brake does not react to persons,
animals, oncoming vehicles, crossing traffic
or when cornering.
PRE-SAFE ® Brake may not detect narrow
vehicles such as motorcycles and vehicles
driving on a different line.
G Risk of accident
Depending on the current speed, PRE-SAFE
Brake decelerates your vehicle by up to
2
4 m/s before performing possible emer-
gency braking. This is equivalent to approx-
imately 40 % of the maximum braking power
of the vehicle. You must additionally apply the
brakes yourself in order to prevent a collision
or minimise an impact. Automatic emergency
braking is not performed until immediately
prior to an accident in the event that you are
unable to avoid one by, for instance, taking
evasive action.
* optional
In order to maintain the appropriate distance
to the vehicle in front and thus prevent a
crash, you must apply the brakes yourself.
At speeds up to approximately 70 km/h,
PRE-SAFE
obstacles, for example stopped or parked
®
is activated
vehicles.
G
If, in a critical driving situation, you do not
receive a visual and acoustic warning:
R
R
R
You must then brake to avoid a collision.
X
The radar sensors are automatically deacti-
vated in the vicinity of radio telescope facili-
ties (
For PRE-SAFE
ing, the radar sensor system must be
switched on and operational.
PRE-SAFE
®
complex traffic situations properly. You can
terminate the braking action of PRE-SAFE
Brake in a non-critical driving situation at any
time if:
R
R
To end this you can either depress the accel-
erator pedal further, activate kickdown or
release the brake pedal.
Driving safety systems
®
Brake can also detect stationary
Risk of accident
®
PRE-SAFE Brake did not detect the risk of
a collision
®
PRE-SAFE Brake is switched off
®
PRE-SAFE Brake has failed
To activate: activate PRE-SAFE
the on-board computer (
The Ä symbol appears in the lower
multi-function display, as long as the HOLD
function is not activated (
On vehicles with parking guidance*, drive
range P must be engaged for the symbol to
be displayed.
page 304).
Y
®
Brake to assist you when driv-
®
Brake does not always detect
an acoustic and visual warning occurs
the vehicle brakes
57
®
Brake in
page 116).
Y
page 135).
Y
®
Z