Mercedes-Benz CL-Class 2012 - Manual (Page 69)

At speeds up to approximately 40 mph
(70 km/h), PRE-SAFE
® Brake can also react
to stationary obstacles, for example stopped
or parked vehicles.
If you approach an obstacle and PRE-SAFE
®
Brake detects a risk of collision, the system
will initially alert you both visually and
acoustically. If you do not brake or take
evasive action, the system will warn you by
automatically braking the vehicle gently. If
there is an increased risk of collision,
preventative passenger protection measures
(PRE-SAFE
® ) are activated ( Y page 51). If the
risk of collision remains at speeds of over
20 mph(30 km/h) and you do not brake, take
evasive action or accelerate significantly, the
vehicle may perform automatic braking up to
emergency braking. Automatic emergency
braking is not performed until immediately
prior to an accident that can no longer be
avoided.
G WARNING
Even if PRE-SAFE ® Brake slows the vehicle
before an imminent rear-end collision, the
system cannot avert a collision without the
intervention of the driver. There is a risk of an
accident. Brake according to the situation or
take evasive action. Delayed intervention by
the driver can lead to an accident.
G WARNING
PRE-SAFE ® Brake cannot always detect
complex traffic situations properly.
In these cases, PRE-SAFE(R) Brake may:
R
give an unnecessary warning and then
brake the vehicle
R neither give a warning nor intervene
There is a risk of an accident. Always pay
particular attention to the traffic situation and
be ready to brake, especially if PRE-SAFE(R)
Brake warns you. Terminate the intervention
in a non-critical driving situation.
In particular, the detection of obstacles can
be impaired if there is:
R
dirt on the sensors or anything else
covering the sensors
R snow or heavy rain
R interference by other radar sources
R the possibility of strong radar reflections,
for example in parking garages
R
a narrow vehicle traveling in front, e.g. a
motorbike
R a vehicle traveling in front on a different line
G
WARNING
PRE-SAFE ® Brake does not react:
R to people or animals
R to oncoming vehicles
R to crossing traffic
R in curves
As a result, PRE-SAFE ® Brake cannot
intervene in critical situations. There is a risk
of an accident. Always pay careful attention
to the traffic situation and be ready to brake.
In order to maintain the appropriate distance
to the vehicle in front and thus prevent a
collision, you must apply the brakes yourself.
X To activate/deactivate: activate or
deactivate PRE-SAFE
® Brake in the on-
board computer ( Y page 342).
After activation, the Ä symbol is
displayed on the left in the instrument
cluster.
For PRE-SAFE ® Brake to assist you when
driving, the radar sensor system must be
switched on (
Y page 344) and operational.
Following damage to the front end of the
vehicle, have the configuration and operation
of the radar sensors checked at a qualified
specialist workshop. This also applies to
collisions at low speeds where there is no
visible damage to the front of the vehicle.
Driving safety systems
67
Safety
Z