2008 AUDI A4 brake

Driving125
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data lights or in stop-and-go traffic. When the Audi hold assist function
is on, you don't have to keep your foot on the brake to prevent the
vehicle from accidentally rolling away. Once it detects that the
vehicle is stopped, Audi hold assist keeps the vehicle stationary. The
green symbol
 in the instrument cluster indicates that the func-
tion is activated. You can now take your foot off the brake pedal.
As soon as you drive off in the normal way, the parking brake will
automatically be released and the vehicle will start moving.
If the conditions for Audi hold assist change and the function is
switched off as a result, the parking brake will be applied automati-
cally to ensure that the vehicle is parked safely. The diode in the
button will go out when the Audi hold assist function is switched
off.
WARNING
The intelligent technology in Audi hold assist cannot defy the laws
of physics. Do not let the extra convenience provided by Audi hold
assist tempt you into taking a safety risk.•
Audi hold assist cannot keep the vehicle stationary in all condi-
tions on a gradient (e.g. if the road is slippery or icy).
•
Audi hold assist must be switched on again each time the
engine is started – Risk of accident!
•
Never get out of the vehicle when the engine is running and
Audi hold assist is switched on – Risk of accident!
•
Always ensure that the vehicle is stopped properly and safely
to avoid injury to yourself and others.Caution
Switch off the Audi hold assist function before driving the vehicle
into a car wash.
Note
•
Audi hold assist can be switched on only when the driver's door
is closed, the driver's seat belt is buckled and the engine is running.
•
Audi hold assist prevents automatic vehicles from creeping
forwards when the brake pedal is released with the car in gear.
•
When the vehicle has been stationary for an extended period,
Audi hold assist will automatically apply the parking brake. In this
case, the green symbol
 in the instrument cluster display will
change to red
.
Cruise control systemApplies to vehicles: with cruise control systemSwitching on
The cruise control system allows you to drive at a
constant speed of 30 km/h or higher.
Fig. 134 Control lever
and pushbutton
document_0900452a81b1b9de.book Seite 125 Donnerstag, 26. Juli 2007 9:16 09

Driving 126
– Pull the lever to position ⇒page 125, fig. 134 to
switch on the system.
– Drive at the speed you wish to set the system to.
– Press the button marked to store the speed.The display will indicate the stored speed, and the green symbol

will appear ⇒fig. 135. The display can vary according to the display
status. In addition, the indicator lamp
 in the instrument cluster
will light up.
A constant speed is maintained by adjusting the engine power or
braking the vehicle accordingly.
WARNING
•
Always direct your full attention to the road, even when you are
using the cruise control system. It is always the driver who is
responsible for determining the speed and for keeping a safe
distance to the other vehicles on the road.
•
For safety reasons, the cruise control system must not be used
in city traffic, stop-and-go traffic, roads with a lot of bends or in
difficult driving conditions (such as ice, fog, loose grit or gravel,
heavy rain, aquaplaning) - this could cause an accident!
•
When you take a turn-off, drive along a motorway exit lane or
pass through roadwork sections, please temporarily switch off the
cruise control system.
•
Please make sure you do not unintentionally rest your foot on
the accelerator - this will override the cruise control system which,
as a result, will not brake the vehicle.Note
•
Vehicles with manual gearbox: The set speed cannot be reached
if the currently selected gear is too high or too low. Change down to
a lower gear if the engine is no longer running smoothly or change
up a gear to avoid overrevving the engine.
•
The brake lights come on when the system brakes the vehicle.
Applies to vehicles: with cruise control systemAdjusting the speed– Push the lever up towards or down towards
⇒page 125, fig. 134 in order to increase or reduce the
cruising speed setting.
– Release the lever to store the current cruising speed.You can alter the set speed in steps of 1 km/h by briefly pressing the
lever upwards or downwards. When you press and hold the lever,
the speed is changed in steps of 10 km/h.
You can still use the accelerator pedal to increase speed in the
normal way, for example to overtake another vehicle. Once you
release the accelerator, the system will revert to the speed you
stored initially.
However, if the vehicle exceeds the programmed speed by more
than 10 km/h for more than 5 minutes, the cruise control system will
Fig. 135 Display:
Selected speed
AA
A1
AB
WARNING (continued)
AA
A+
A-
document_0900452a81b1b9de.book Seite 126 Donnerstag, 26. Juli 2007 9:16 09

Driving127
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data be deactivated temporarily. The green symbol in the display will
change to white but the stored speed will be retained.
Applies to vehicles: with cruise control systemPre-selecting a speed
You can pre-select a desired speed while the vehicle is
stationary.– Switch on the ignition.
– Pull the lever to position 1 ⇒page 125, fig. 134.
– Push the lever up towards or down towards in
order to increase or reduce the cruising speed setting.
– Release the lever to store the cruising speed setting
displayed.This function allows you to enter the desired cruise control setting
speed ahead of time, for example before joining a motorway. Once
you are on the motorway, you can activate the cruise control system
by pulling the lever to position .Applies to vehicles: with cruise control systemSwitching off the cruise control systemSwitching off temporarily
– Press the brake pedal, or
– Manual gearbox: Press the clutch pedal for a relatively
long period, or
– Push lever to position (click stop not engaged)
⇒page 125, fig. 134, or– Drive more than 10 km/h faster than the stored speed
over a period of more than 5 minutes.
Switching off completely
– Press the lever to position (click stop engaged), or
– Switch off the ignition.
The speed setting will remain stored after the system is temporarily
deactivated. To resume the programmed cruising speed, release the
clutch or brake pedal and pull the lever to position .
The stored speed will be deleted once the ignition is switched off.
WARNING
Do not resume the programmed cruising speed if this is too high
for the traffic conditions - this can cause accidents.
AA
A+
A-
A1
AA
A2
AA
A2
A1
document_0900452a81b1b9de.book Seite 127 Donnerstag, 26. Juli 2007 9:16 09

adaptive cruise control (ACC)129
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
•
Adaptive cruise control will not react when approaching a
stationary obstacle, e.g. the end of a traffic jam or a broken-down
vehicle, or if a vehicle should come towards you in the same lane.
•
Please make sure you do not unintentionally rest your foot on
the accelerator - this will override the adaptive cruise control
system which, as a result, will not automatically brake the vehicle.Note
•
For safety reasons, the speed setting will be deleted when the
ignition is switched off.
•
Switching on the adaptive cruise control automatically activates
the Electronic Stabilisation Program (ESP) and the traction control
system (ASR). These two systems cannot be deactivated while the
adaptive cruise control is switched on.
•
Damage caused by impacts (e.g. if the vehicle is damaged when
parking) can affect the radar sensor settings. This can cause the
system to malfunction or switch off completely.
•
The radar sensor is heated. However, in winter conditions, you
should make sure that the radar sensor is free of ice and snow
before you set off. If necessary, carefully clean the cover of the radar
sensor and the surrounding area ⇒page 128, fig. 136.
•
To make sure that the radar sensor is fully operative, do not
attach any objects (e.g. stickers, add-on parts or other accessories)
to the area surrounding the radar sensor. Do not paint the area
surrounding the radar sensor.
Applies to vehicles: with adaptive cruise control and manual gearboxVehicles with manual gearbox
The driver of a vehicle with a manual gearbox of course
has to change gears as appropriate, even when the adap-
tive cruise control is activated.The adaptive cruise control is available from the second to the sixth
gear (when driven in normal engine speed range).
When the adaptive cruise control is activated, the driver must press
the clutch pedal as normal in order to change gear. When changing
gear or pressing the clutch pedal (for up to 20 seconds), the adap-
tive cruise control will remain activated.
When changing gear, the driver does not have to accelerate after
engaging a gear as the engine torque will be coordinated by the
adaptive cruise control.
The following situations may lead to an automatic deactivation of
the adaptive cruise control:•
pressing the clutch pedal too long (longer than approx.
20 seconds)
•
incorrect changing of gears and/or use of the clutch pedalNote
•
The adaptive cruise control cannot be activated while changing
gears.
WARNING (continued)
document_0900452a81b1b9de.book Seite 129 Donnerstag, 26. Juli 2007 9:16 09

adaptive cruise control (ACC) 130Applies to vehicles: with adaptive cruise controlHow does the distance control work?
Vehicles in front are detected by a radar sensor.The adaptive cruise control uses a radar sensor ⇒fig. 137 which is
integrated in the front of the vehicle and is subject to certain system
limitations ⇒page 140. Stationary objects are disregarded. The
system requires reflecting surfaces in order to be able to measure
the distance. If the ACC is unable to measure the distance it will not
respond.
No vehicle in front
When there is no vehicle in front, the adaptive cruise control works
like a speed control system. It maintains a constant target speed
specified by the driver.
Vehicle in front
If you catch up with a vehicle driving in front, the adaptive cruise
control will reduce the speed accordingly (within the limits set by
the system ⇒page 138, “Driver intervention prompt” and
⇒page 140, “System limitations”) and adapt it to the speed of the
vehicle in front. Then the system will try to adjust the distance to the
car in front according to the settings selected. During the adjust-
ment process the system may temporarily not be able to adhere to
the distance you had specified ⇒ in “Description” on page 128.If the vehicle in front accelerates, the adaptive cruise control will
also accelerate, up to the target speed you have specified.
Driver intervention prompt
In some situations, it is necessary for the driver to brake the vehicle
with the foot brake in order to keep a safe distance to the vehicle in
front or to avoid a collision. In this case, a warning message will
appear in the display and you will also hear a warning tone
⇒page 138.
When overtaking
When you move into the overtaking lane and no vehicle is detected
in front, the adaptive cruise control will accelerate up to the target
speed and then maintain it.
Overriding
You can still use the accelerator pedal at any time to increase speed
in the normal way. The previously programmed speed will be
resumed when the accelerator pedal is released.
Note
•
Please note that acceleration will vary depending on the preset
programme. If you have, for example, selected “Distance 1” and the
driving programme “dynamic”, acceleration will be more "sporty".
However, if you have set the system to “Distance 4” and driving
programme “comfort”, acceleration will be more gradual. For a
detailed description please refer to ⇒page 133, “Setting the
distance”.
•
No vehicle in front, Vehicle in front and a Driver intervention
prompt will be indicated by an indicator lamp ⇒page 134, “Indi-
cator lamp and display in the speedometer”.
Fig. 137 Area covered
by radar sensor
document_0900452a81b1b9de.book Seite 130 Donnerstag, 26. Juli 2007 9:16 09

adaptive cruise control (ACC)131
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Applies to vehicles: with adaptive cruise controlSwitching the system on and off– Pull the control lever to position ⇒fig. 138 to switch
on the system.
– Press the control lever to position (click stop engaged)
to switch the system off.Applies to vehicles: with adaptive cruise controlSetting the speedImportant: The system must be switched on.– Drive at the desired speed. The speed must be in the
range between 30 and 200 km/h.
– Press the button -arrow- ⇒fig. 139 to confirm the
target speed you wish to store.
When the button is released, the current speed is stored in the
memory and the vehicle will then maintain this speed.
One or two red diodes will light up in the speedometer dial
⇒page 134 to mark the speed which is currently stored in the
system. At the same time, the speed will briefly be displayed in the
system status indicator ⇒page 136.
Note
For safety reasons, the speed setting will be deleted when the igni-
tion is switched off.Applies to vehicles: with adaptive cruise controlSetting a new speed
The speed can be altered without touching the acceler-
ator or the brake.
Fig. 138 Control lever
for: Switching the
system on and off
A1A2
Fig. 139 Control lever
for: Setting speed
SET
SET
Fig. 140 Control lever
for: Setting a new
speed
document_0900452a81b1b9de.book Seite 131 Donnerstag, 26. Juli 2007 9:16 09

adaptive cruise control (ACC) 132
Setting a higher speed
–Briefly move the control lever up towards ⇒fig. 140.
The speed will be incremented by one graduation on the
scale in the speedometer.
– Press the control lever up towards and hold it in this
position. The speed setting is indicated by the diodes in
the speedometer; the speed will be increased accord-
ingly.
Setting a lower speed
–Briefly move the control lever down towards . The
speed will be reduced by one graduation on the scale in
the speedometer.
– Press the control lever down towards and hold it in
this position. The speed setting is indicated by the
diodes in the speedometer; the speed will be reduced
accordingly.After releasing the control lever, the system will adapt your speed to
the setting you have selected.
Following any changes, the new stored speed will be displayed
briefly in the system status indicator ⇒page 136.
Note
You can still use the accelerator pedal at any time to increase speed
in the normal way. The previously programmed speed will be
resumed when the accelerator pedal is released. You can set a new
speed at any time by pressing the button ⇒page 131,
fig. 139.
Applies to vehicles: with adaptive cruise controlSwitching off the system (with speed memory function) and reactivating it
In some situations it makes sense to switch off the
system.Switching off the system (with speed memory
function)
– Press the brake pedal, or
– Press the control lever in direction ⇒fig. 141.
Reactivating the system
– Release the brake pedal and pull the lever in direction .
WARNING
It is dangerous to resume a set speed which is too high for the
current road, traffic or weather conditions - risk of accident.
Note
When switching off the system (with speed memory function) the
speed stored at this point remains in the memory.
A+
A+
A-
A-
SET
Fig. 141 Control lever
for: Switching off the
system (with speed
memory function) and
reactivating it
A2
A1
document_0900452a81b1b9de.book Seite 132 Donnerstag, 26. Juli 2007 9:16 09

adaptive cruise control (ACC)135
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data Target speed
The target speed set by the driver is indicated by a red diode in the
speedometer.
If the speed setting is between two graduations on the speedom-
eter dial, the two closest diodes will both light up ⇒fig. 143.
It is only possible to set target speeds ranging from 30 to 200 km/h.
This speed range is illuminated slightly by the diodes on the speed-
ometer dial.
Indicator lamp (symbol)
•
No vehicle in front: The green indicator lamp ⇒page 134,
fig. 144 shows that the adaptive cruise control system is in cruise
mode and that there is no vehicle in front. It maintains the stored
target speed.
•
Vehicle in front: The green indicator lamp shows that the
system has detected a vehicle in front. The speed is adapted to the
vehicle in front. The adaptive cruise control system accelerates and
brakes the vehicle automatically.
•
Driver intervention prompt: When the red indicator lamp
flashes , this is a warning for the driver to intervene. The driver
has to brake the vehicle with the foot brake. This warning lamp will
always appear when the adaptive cruise control system alone is not
able to brake the vehicle sufficiently to maintain a safe distance to
a vehicle in front. An audible alarm (warning tone) will also sound
when the lamp starts to flash. For further information on the driver
intervention prompt ⇒page 138.Note
•
If you exceed the target speed by using the accelerator, the
driver intervention prompt will not be accompanied by a warning
tone. The indicator lamp shown in the speedometer will also switch
off if the target speed is exceeded.
•
You can change the volume of the warning tone on the sound
system or MMI* ⇒page 139, “Setting the warning tone volume and
driving program”.
Applies to vehicles: with adaptive cruise controlInstrument cluster displayRepeatedly press the button on the windscreen wiper lever
to select whether you wish to display information regarding the on-
board computer, the navigation system* or the adaptive cruise
control in this section of the display screen.
Vehicle image
Distance
System status
Vehicle image
The vehicle image will show you whether the system has detected a
vehicle in front.•
Vehicle outlined: No vehicle in front
•
Vehicle in white: A vehicle in front has been detected
•
Vehicle in red: Driver intervention prompt
Distance
The arrows and scale indicate the distance to the vehicle in front.
•
No vehicle in front: If there is no vehicle in front, no arrows will
be shown.
AA
AA
AB
AB
AC
AC
Fig. 145 Instrument
cluster: Display
RESET
AAABACAAAB
document_0900452a81b1b9de.book Seite 135 Donnerstag, 26. Juli 2007 9:16 09