2008 AUDI A4 brake sensor

adaptive cruise control (ACC)143
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data 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 for determining your speed and for keeping a safe distance to the
other vehicles on the road.
•
Always maintain the statutory minimum safety distance to the
vehicle in front (risk of accident).
•
Due to the system limitations, the Audi braking guard will not
react in certain situations, for example when approaching a
stationary obstacle (such as the end of a traffic jam or a broken-
down vehicle).
•
Please note that the Audi braking guard is subject to limita-
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.
•
The radar sensor's "field of vision" can be impaired by rain,
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.
•
Reflecting objects, such as crash barriers or the entrance to a
tunnel, could impair the function of the radar sensor.
Applies to vehicles: with adaptive cruise controlStatus messages in the instrument cluster displaybraking 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.
WARNING (continued)
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Index 334
Operation . . . . . . . . . . . . . . . . . . . . . . . 121
Parking . . . . . . . . . . . . . . . . . . . . . . . . . 122
Releasing and applying . . . . . . . . . . . 121
Warning lamp . . . . . . . . . . . . . . . . . 19, 20
Electronic differential lock
How the system works . . . . . . . . . . . . 222
Warning lamp . . . . . . . . . . . . . . . . . . . . 19
Electronic immobiliser . . . . . . . . . . . . . 14, 43
Electronic stabilisation program
How the system works . . . . . . . . . . . . 222
Warning lamp . . . . . . . . . . . . . . . . . . . . 17
Emergency braking function . . . . . . . . . . 123
Emergency key . . . . . . . . . . . . . . . . . . . . . . 45
Emergency release
Ignition key . . . . . . . . . . . . . . . . . . . . . . 46
Emission control systems
Catalytic converter . . . . . . . . . . . . . . . 229
Diesel particulate filter . . . . . . . . . . . . 229
Emissions . . . . . . . . . . . . . . . . . . . . . . . . . 321
Engine compartment
Safety notes . . . . . . . . . . . . . . . . . . . . . 255
Engine compartment layout . . . . . . . . . . 256
Engine data
SeePerformance, weights and
dimensions . . . . . . . . . . . . . . . . . . . . 323
Engine hood
SeeBonnet . . . . . . . . . . . . . . . . . . . . . . 254
Engine management
(EPC) warning lamp . . . . . . . . . . . . . . . 16
Engine oil . . . . . . . . . . . . . . . . . . . . . . 34, 257
Checking oil level . . . . . . . . . . . . 258, 259
Consumption . . . . . . . . . . . . . . . . 258, 259
LongLife Service . . . . . . . . . . . . . . . . . 257Topping up . . . . . . . . . . . . . . . . . . . . . . 259
See alsoPerformance, weights and
dimensions . . . . . . . . . . . . . . . . . . . . 323
Engine oil capacity
SeePerformance, weights and
dimensions . . . . . . . . . . . . . . . . . . . . 323
Engine oil pressure
Warning lamp . . . . . . . . . . . . . . . . . . . . 33
Engine oil sensor
Malfunction . . . . . . . . . . . . . . . . . . . . . . 38
Environmental compatibility . . . . . . . . . . 231
Environmental tips
Filling the tank . . . . . . . . . . . . . . . . . . . 252
Heated rear window . . . . . . . . . . . 98, 106
Leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Roof carrier . . . . . . . . . . . . . . . . . . . . . . 84
EPC
SeeEngine management . . . . . . . . . . . 16
ESP
SeeElectronic stabilisation program . 17
Ethanol fuel . . . . . . . . . . . . . . . . . . . . . . . . 251
Exterior mirrors . . . . . . . . . . . . . . . . . . . . . . 70
FFastening rings . . . . . . . . . . . . . . . . . . 79, 193
Filling the tank . . . . . . . . . . . . . . . . . . . . . 252
Releasing the tank flap manually . . . 253
Fire extinguisher . . . . . . . . . . . . . . . . . . . . 283
First-aid kit . . . . . . . . . . . . . . . . . . . . . . . . . 282
Floor mats . . . . . . . . . . . . . . . . . . . . . 191, 192
Fog lights . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Four-wheel drive . . . . . . . . . . . . . . . . . . . . 226Front passenger
SeeSitting position . . . . . . . . . . . . . . . 189
Fuel
Biodiesel . . . . . . . . . . . . . . . . . . . . . . . . 251
Capacity . . . . . . . . . . . . . . . . . . . . . . . . 321
Consumption . . . . . . . . . . . . . . . . . . . . 321
Current fuel consumption . . . . . . . . . . 25
Diesel . . . . . . . . . . . . . . . . . . . . . . . . . . 251
Ethanol . . . . . . . . . . . . . . . . . . . . . . . . . 251
Fuel level low . . . . . . . . . . . . . . . . . . . . . 37
Petrol . . . . . . . . . . . . . . . . . . . . . . . . . . 251
Saving fuel . . . . . . . . . . . . . . . . . . . . . . 229
Fuel consumption . . . . . . . . . . . . . . . . . . . 321
Fuel range . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Fuel tank flap . . . . . . . . . . . . . . . . . . . . . . . 252
Fuse, changing . . . . . . . . . . . . . . . . . . . . . 300
GGarage door opener . . . . . . . . . . . . . . . . . 179
Gear-change indicator . . . . . . . . . . . . . . . . 22
Generator
SeeAlternator . . . . . . . . . . . . . . . . . . . . 32
Glove box . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Glow plug system
Indicator lamp . . . . . . . . . . . . . . . . . . . . 16HHandbrake
SeeElectro-mechanical parking brake . . .
121
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