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Vehicles with Active Distance Assist
DISTRONIC: the autonomous braking function
is available in the following speed ranges:
R
4 - 124 mph (7 - 200 km/h) for moving
objects
R
4 - 31 mph (7 - 50 km/h) for stationary
objects
Due to the nature of the system, particularly
complicated but non-critical driving conditions
may also cause the autonomous braking func-
tion to intervene.
If the autonomous braking function requires a
particularly high braking force, preventative
passenger protection measures (PRE-SAFE
®
)
are activated simultaneously (Y page 54).
Situation-dependent brake boosting
effect
General information
i
Observe the "Important safety notes" sec-
tion (Y page 58).
With the help of the radar sensor system, Active
Brake Assist can detect obstacles that are in the
path of your vehicle for an extended period of
time.
If Active Brake Assist detects a risk of collision
with the vehicle in front, it calculates the brake
pressure necessary to avoid a collision. If you
apply the brakes forcefully, the situation-
dependent brake boosting effect automatically
increases the brake pressure to a degree appro-
priate to the traffic situation.
The situation-dependent brake boosting effect
provides braking assistance in hazardous situa-
tions at speeds above 4 mph (7 km/h). It uses
radar sensor technology to assess the traffic
situation.
The situation-dependent brake boosting effect
is capable of reacting to moving objects that
have already been detected as such at least
once over the period of observation, up to a
speed of around 155 mph (250 km/h).
The situation-dependent brake boosting effect
reacts to stationary obstacles up to a speed of
approximately 44 mph (70 km/h).
If the situation-dependent brake boosting effect
demands particularly high brake pressure, pre-
ventative passenger protection measures (PRE-
SAFE
®
) are triggered simultaneously
(Y page 54).
X
Keep the brake pedal depressed until the
emergency braking situation is over.
ABS prevents the wheels from locking.
The brakes will work normally 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
The situation-dependent brake boosting effect
is then deactivated.
Important safety notes
i
Observe the "Important safety notes" sec-
tion for driving safety systems (Y page 58).
G
WARNING
Adaptive Brake Assist does not react:
R
to people or animals
R
to oncoming vehicles
R
to crossing traffic
R
when cornering
As a result, Adaptive Brake Assist may not
intervene in all critical conditions. There is a
risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
G
WARNING
Adaptive Brake Assist cannot always clearly
identify objects and complex traffic situa-
tions.
In such cases, Adaptive Brake Assist might:
R
intervene unnecessarily
R
not intervene
There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake. Terminate the
intervention in a non-critical driving situation.
Due to the nature of the system, complex but
non-critical driving conditions may also cause
Active Brake Assist to intervene.
Even if Active Brake Assist is not available due to
a malfunction in the radar sensor system, the
brake system is still available with full brake
boosting effect and BAS.
Driving safety systems
61
Safety
Z
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