Audi A4 Owner's Manual page 145

document_0900452a81b1b9de.book Seite 143 Donnerstag, 26. Juli 2007 9:16 09
which can shorten the system response time. The warning will be
deactivated if you press the accelerator pedal right down in order to
overtake.
The system draws the driver's attention to two different hazardous
situations:
Distance !
A distance warning will be given if you travel too close to the vehicle
in front for longer than 5 seconds. For example, if the distance is
less than 9 m at 80 km/h, a message will appear in the instrument
cluster display ⇒ page 142, fig. 156.
If the vehicle in front were to brake hard, a collision would no longer
be avoidable, even if you reacted immediately. In this case, you
should leave more room between your car and the vehicle in front.
Speed
If the vehicle in front of you is travelling in the same lane at a much
slower speed or if it brakes hard, the Audi braking guard will calcu-
late the time at which a collision can be avoided only by emergency
braking or evasive action. When the system warns you, it is possible
to avoid a potential collision with the vehicle in front by braking or
changing lane. There are two warning levels:
Early warning: A message will appear in the instrument cluster
display and you will also hear a warning tone.
Acute warning: The second (acute) warning will be triggered if
you do not react to the advance warning. There will automatically be
a short dab of the brakes to remind you to concentrate on the traffic.
If you brake hard, the brake assist system ⇒ page 222 helps you to
achieve the optimum braking effect.
WARNING
Please always direct your full attention to the road, even when the
Audi braking guard is activated. It is always you who is responsible
Controls
for determining your speed and for keeping a safe distance to the
other vehicles on the road.
vehicle in front (risk of accident).
react in certain situations, for example when approaching a
stationary obstacle (such as the end of a traffic jam or a broken-
down vehicle).
tions in tight bends on account of the radar sensor's field of vision.
This means that obstacles may not be detected in certain situa-
tions.
snow or a lot of water on the road. This results in vehicles not
being reliably recognised or, in some circumstances, not being
detected at all. Always keep the road ahead within your field of
vision.
tunnel, could impair the function of the radar sensor.
Applies to vehicles: with adaptive cruise control
Status messages in the instrument cluster
display
braking guard brake jolt
This driver message appears when the brakes are dabbed due to an
acute warning.
braking guard off
This driver message appears when the system is switched off in the
MMI. The message also appears briefly after you begin driving if the
system is switched off.
Safety Driving tips General maintenance
adaptive cruise control (ACC)
WARNING (continued)
Always maintain the statutory minimum safety distance to the
Due to the system limitations, the Audi braking guard will not
Please note that the Audi braking guard is subject to limita-
The radar sensor's "field of vision" can be impaired by rain,
Reflecting objects, such as crash barriers or the entrance to a
Self-help
143
Technical data