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Driving safety systems
73
permitted. Do not tamper with, alter, or use
in any non-approved way.
Any unauthorized modification to this
device could void the user’s authority to
operate the equipment.
PRE-SAFE
®
will only assist you by initiating
braking automatically when the driver and
front passenger have their seat belts
fastened.
Using the radar sensors, PRE-SAFE
®
Brake
detects obstacles that are in your driving path
for a sufficient period of time for the system
to recognize it. If you approach a vehicle and
PRE-SAFE
®
Brake has established that the
distance to the vehicle ahead at your current
speed is so close that PRE-SAFE
®
Brake will
not be capable of slowing the vehicle
sufficiently, the system will initially warn you
visually and acoustically.
When traveling in Canada in a vehicle not
registered in Canada, you must switch off the
radar sensor system (Y page 247). Canadian
law does not permit the use of the radar
sensor system for vehicles from outside of
Canada.
When you switch off the radar system, the
following functions are deactivated:
R
PRE-SAFE
®
Brake
R
BAS Plus (Y page 66)
R
DISTRONIC Plus (Y page 350)
R
Park Assist (Y page 369)
R
Blind Spot Assist (Y page 382)
R
Advanced Parking Guidance (Y page 373)
G
Warning!
PRE-SAFE
®
Brake will only respond with
brake assistance if it has clearly detected
an object. Detection can be impeded by
R
dirty or covered sensors
R
snowfall or heavy rain
R
disturbance from other radar sources
R
strong radar reflection such as in parking
garages
PRE-SAFE
®
uses radar signals that are not
reflected well by narrow objects and
absorptive materials. For this reason PRE-
SAFE
®
will not react to persons, animals,
and approaching traffic or cross-traffic.
PRE-SAFE
®
may not detect narrow vehicles
driving in front of you, such as motorcycles
and vehicles driving offset from your
vehicle center.
When the distance to the forward vehicle is
too small, the distance warning lamp l in
the instrument cluster comes on. If you
approach the forward vehicle very quickly,
you will hear a warning signal.
If you do not apply the brakes yourself or
maneuver around a sensed obstacle, the
vehicle will brake lightly automatically. PRE-
SAFE
®
(Y page 56) is activated when the
distance to the vehicle ahead at your current
speed is so close that PRE-SAFE
®
Brake will
not be capable of slowing the vehicle
sufficiently.
G
Warning!
PRE-SAFE
®
Brake brakes your vehicle with
a maximum of 13 ft/s
2
(4 m/s
2
). This
corresponds to about 40% of the maximum
deceleration ability of your vehicle. This
automatic braking is intended only to
initiate the braking if the driver has not
already done so. The driver must apply the
brakes in order to prevent a collision.
PRE-SAFE
®
Brake applies the brake pedal
automatically which results in the brake
pedal moving. Therefore keep driver’s foot
Safety and security
Z