Mercedes-Benz C-Class Operator's Manual page 86

Driving safety systems
84
Recognition by the radar sensor system is
also impaired in the event of:
there is dirt on the sensors or anything else
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covering the sensors
there is interference by other radar sources
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there are strong radar reflections, for
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example in parking garages
a narrow vehicle traveling in front, e.g. a
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motorbike
a vehicle traveling in front on a different line
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relative to the center of your vehicle
Recognition by the camera system is also
impaired in the event of:
dirt on the camera or if the camera is cov-
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ered
there is glare on the camera system, e.g.
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from the sun being low in the sky
darkness
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if:
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pedestrians move quickly, e.g. into the
-
path of the vehicle
the camera system no longer recognizes
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a pedestrian as a person due to special
clothing or other objects
a pedestrian is concealed by other
-
objects
the typical outline of a person is not dis-
-
tinguishable from the background
Following damage to the front end of the vehi-
cle, have the configuration and operation of
the radar sensors checked at a qualified spe-
cialist workshop. This also applies to colli-
sions at low speeds where there is no visible
damage to the front of the vehicle.
Following damage to the windshield, have the
configuration and operation of the camera
system checked at a qualified specialist work-
shop.
Function
To activate/deactivate: activate or deac-
X
tivate PRE-SAFE ® Brake in the on-board
computer ( page 205).
Y
If the PRE-SAFE ® Brake is not activated, the
æ symbol appears in the multifunction
display.
Starting at a speed of around 4 mph (7 km/h),
this function warns you if you rapidly
approach a vehicle in front. An intermittent
warning tone will then sound and the ·
distance warning lamp will light up in the
instrument cluster.
Brake immediately to defuse the situation.
X
or
Take evasive action provided it is safe to do
X
so.
PRE-SAFE ® Brake can also brake the vehicle
automatically under the following conditions:
the driver and front-passenger have their
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seat belts fastened
and
the vehicle speed is between approx-
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imately 4 mph (7 km/h) and 124 mph
(200 km/h)
At speeds of up to approximately 44 mph
(70 km/h) PRE-SAFE ® Brake can also detect:
stationary objects in the path of your vehi-
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cle, e.g. stopped or parked vehicles
pedestrians in the path of your vehicle
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If there is an increased risk of collision,
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preventive passenger protection measures
(PRE-SAFE ® ) are activated.
If the risk of collision with the vehicle in front
remains and you do not brake, take evasive
action or accelerate significantly, the vehicle
may perform automatic emergency braking,
up to the point of full brake application. Auto-
matic emergency braking is not performed
until immediately prior to an imminent acci-
dent.