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Audi braking guard
Description
Applies to vehicles: with adaptive cruise control
Audi braking guard warns you of a possible
collision with a moving vehicle up ahead .
Fig. 149 Display in the instrument cluster
The Audi braking guard is act ive from a speed
of approx. 20 mph (30 km/h) and wor ks w ith-
in the system limits ¢
page 127 even when
the adaptive cruise contro l is deactivated .
A radar sensor is built into the front of the ve-
hicle
¢page 116, fig. 130. The system is in-
tended to measure the distance to reflect ive
surfaces . If a measurement is not possible,
the system does not respond.
When the measurement has been taken, the
system can recognize a possibly hazardous sit -
uation, for example, whe n a vehicle up ahead
in your lane of trave l sudden ly brakes or when
your own vehicle is moving at high speed to-
wards a much slower vehicle up ahead. As
soon as the system senses that a possible col-
lision with the vehicle up ahead can only be
avoided by immed iate full brake appli cation or
by an avoidance maneuver, a warning appears.
The system has a defau lt response time to be
able to signal before a collision occurs. This
system response time is automat ically re-
duced if you accelerate actively, fo r example
to join a highway . Braking, tra nsverse acceler-
ation and the steering angle can lead to a re-
duced system response time. The warning is
deactivated if you begin to overtake with full
acceleration .
Ada p ti v e crui se control 129
The system can make you aware of two diffe r-
ent hazardous situations:
Distance
The distance warning is given if the system
calculates that there is not enough distance
to the vehicle up ahead a period of more than
S seconds. If the distance is less than 30 f eet
(9 meters) at SO mph (80 km/h), for examp le,
an optical display comes on in the instrument
cluster¢ fig. 149.
If the vehicle ahead brakes sharp ly, Audi brak-
ing guard cannot help you to avoid a collision,
even in the case of an immediate response.
Take immed iate action to avoid the collision
and increase the distance to the vehicle up
ahead.
Speed
If there is a much slower vehicle moving up
ahead in your lane, or if the vehicle ahead
brakes sharply, the Audi braking guard calcu-
lates the point from which a collision can only
be avoided by full braking or by an avoidance
maneuver. If a warning does sound, a possible
collision with the vehicle in front can only be
avoided th rough an evasive maneuve r or by
braking.
The warning is given in two stages :
- Pre-warning: A visual display appears in the
instrument cluster and a warning tone
sounds.
- Acute wa rning : If you do not respond to the
pre-warn ing, the second stage warning is
given. A quick brake application helps to di-
rect your attention to the road and traffic
situat ion.
Under heavy braking, the brake assistant
¢
page 116 also helps you benef it from maxi-
mum braking eff iciency.
A WARNING
I nattention can cause collisions, other ac-
cidents and serious perso nal inj uries.
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