brakes AUDI A4 2020 User Guide
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Page 116 of 296
Assist systems
Assist systems
General information
Safety precautions
ZA WARNING
— As the driver, you are always completely re-
sponsible for all driving tasks. The assist
systems cannot replace the driver's atten-
tion. Give your full attention to driving the
vehicle, and be ready to intervene in the
traffic situation at all times.
— Activate the assist systems only if the sur-
rounding conditions permit it. Always adapt
your driving style to the current visual,
weather, road, and traffic conditions.
— Keep in mind that Audi pre sense front can
apply the brakes unexpectedly. Always se-
cure any cargo or objects that you are trans-
porting to reduce the risk of damage or in-
jury.
— For the assist systems to be able to react
correctly, the function of the sensors and
cameras must not be restricted. Note the in-
formation on sensors and cameras
> page 115.
@ Tips
— Pay attention to applicable local regulations
relating to driving tasks, leaving space for
emergency vehicles, vehicle distance, speed,
parking location, wheel placement, etc. The
driver is always responsible for following
the laws that are applicable in the location
where the vehicle is being operated.
— You can cancel a steering or braking inter-
vention by the system, by braking or accel-
erating noticeably, steering, or deactivating
the respective assist system.
— Always check the assist systems settings be-
fore driving.
114
System limitations
ZA WARNING
— The use of an assist system cannot over-
come the natural laws of physics. A collision
cannot be prevented in certain circumstan-
ces.
— Warnings, messages, or indicator lights may
not be displayed or initiated on time or cor-
rectly, for example, if vehicles are approach-
ing very fast.
— Corrective interventions by the assist sys-
tems, such as steering or braking interven-
tions, may not be sufficient or they may not
occur. Always be ready to intervene.
G) Tips
— Due to the system limitations when detect-
ing the surrounding area, the systems may
warn or intervene unexpectedly or too late
in certain situations. The assist systems may
also interpret a driving maneuver incorrectly
and then warn the driver unexpectedly.
— The systems may not function as expected
in unusual driving situations, such as driving
offroad, on unpaved roads, on loose ground,
on inclines, or on grooves in the road.
— The systems may not function correctly in
unclear traffic situations, such as turning
lanes, exit ramps, construction zones, rises
or dips that obstruct visibility, intersections,
toll stations, or city traffic.
— The detection of the surrounding area can
be limited, for example by vehicles driving
ahead or by rain, snow, heavy spray, or light
shining into the camera.
— If accessories have been mounted on the
steering wheel, the ability for the steering
systems to react may be limited.
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Driver assistance
Driver assistance
Cruise control system
Applies to: vehicles with cruise control system
The cruise control system assists the driver in
maintaining a constant speed above approxi-
mately 15 mph (20 km/h). The system maintains
the desired speed by braking and accelerating.
ZA\ WARNING
— Always pay attention to the traffic around
your vehicle when the cruise control system
is in operation. As the driver, you are always
responsible for controlling your vehicle
speed and the distance between your vehicle
and
other vehicles.
— For safety reasons, cruise control should not
be used in the city, in stop-and-go traffic, on
winding roads, and when road conditions are
poor (such as ice, fog, gravel, heavy rain,
and conditions that could lead to hydroplan-
ing), because this increases the risk of an ac-
cident.
— Switch the cruise control off temporarily
when driving in turning lanes, highway exits,
or in construction zones.
—To reduce the risk of an accident, you should
only resume the stored speed if it is suitable
for the current traffic conditions.
() Note
Before driving downhill a long distance ona
steep hill, decrease your speed and select a
lower gear. This makes use of the engine brak-
ing effect and reduces the load placed on the
brakes.
@) Tips
The brake lights turn on when the brakes are
applied automatically.
Switching the system on
Applies to: vehicles with cruise control system
BFV-0220
Fig. 110 Lever: switching on the cruise control system
Requirement: the ignition must be switched on.
> To switch the system on, pull the lever toward
you to position @).
The ICRUISE| or i$) indicator light and the corre-
sponding message will appear in the instrument
cluster.
ZA\ WARNING
If the brakes are malfunctioning (for example,
overheating) while the cruise control system
is switched on, the regulating functions may
shut off automatically.
etal Rome ladle Rogen)
yet -t-te)
Applies to: vehicles with cruise control system
When the vehicle is stationary, you can preselect
the cruise control speed or activate the speed
while driving.
Requirement: the system must be switched on.
> To preselect a cruise control speed when the ve-
hicle is stationary, tap the lever toward (@)/G)
=> page 123, fig. 110.
> To activate the cruise control speed, pull the
lever
toward position @ while driving.
> To set the current driving speed as the cruise
control speed, press the button @) on the lever.
The active cruise control speed is indicated with
the Gl or indicator light in the instrument
cluster. >
123
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Driver assistance
An additional indicator appears in the head-up
display*.
Changing the cruise control speed
Applies to: vehicles with cruise control system
> To increase or decrease the cruise control speed
in small increments, tap the lever up to the
first level toward @)/G) > page 123, fig. 110.
> To increase or decrease the cruise control speed
in larger increments, tap the lever up to the
second level toward @)/C).
> To increase or decrease the cruise control speed
continuously, tap and hold the lever at the first
or second level toward @)/C).
Overriding or deactivating the cruise
control speed
Applies to: vehicles with cruise control system
You can override or deactivate the cruise control
system. When you deactivate the system, your
cruise control speed will be stored and you can
resume that speed.
Requirement: the system must be switched on
and activated.
Overriding
> To temporarily override the cruise control
speed, press the accelerator pedal.
> Once you release the accelerator pedal, the sys-
tem will adjust back to the stored cruise control
speed.
If you override the cruise control system for a
long period of time, the cruise control system
will be deactivated. The Gg or {§8) indicator
light will be displayed and the cruise control
speed will be saved.
Deactivating
> To deactivate the cruise control speed, press
the lever toward (2) (not locked into place)
=> page 123, fig. 110, or
> Press the brake pedal.
124
ZA WARNING
Resting your foot on the accelerator pedal
could override the cruise control. This will pre-
vent braking interventions by the system.
Seem Lola
Applies to: vehicles with cruise control system
When you switch the system off completely, the
cruise control speed will be deleted.
Requirement: the system must be switched on.
> To switch the system off, press the lever toward
@ (locked into place) > page 123, fig. 110, or
> Switch the ignition off.
Applies to: vehicles with cruise control system
Gir / §) Speed control system: currently un-
available. See owner's manual
If the indicator light turns on and this message
appears, the cruise control system has been deac-
tivated. There is a temporary malfunction, for ex-
ample the brakes are overheating. Switch the
cruise control system on again later.
Efficiency assist
Applies to: vehicles with efficiency assist
Efficiency assist can assist the driver with predic-
tive information in order to reduce fuel consump-
tion. Depending on vehicle equipment, the sys-
tem may access data from the navigation system,
the camera behind the windshield, and the radar
sensors.
Adjusting the efficiency assist
You can adjust efficiency assist functions individ-
ually. The settings depend on the vehicle equip-
ment.
— Predictive messages > page 125.
— Predictive control > page 126.
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Driver assistance
and road conditions. If necessary, apply the
brakes and reduce the selected speed to be
maintained in the Adjustment to curves
along route setting to reduce the risk of an
accident.
G) Tips
— Predictive control can exceed or drop below
the maximum permitted speed. The driver
is responsible for adhering to the permitted
speed limit.
— The traffic signs on the road always take pri-
ority over the display. The driver is always
responsible for adhering to the regulations
applicable in the country where the vehicle
is being operated.
— Ifa speed limit is detected, the marking @
= page 128 of the set speed limit will be ad-
justed even if Audi adaptive cruise control is
not actively regulating.
— Control by the system depends on which
adaptive cruise control driving program is
set or on the selected Audi drive select*
mode.
— After switching on the ignition and first
driving onto a freeway or similar road with-
out a speed limit, the system will regulate
the speed to 80 mph (130 km/h)). Then
the system adjusts to the last speed set by
the driver.
— There is no adaptation to speed limits when
driving through highway interchanges and
when driving on or off the expressway.
— The system can fail to provide control or the
control may be faulty if the values from the
camera-based traffic sign recognition” are
incorrect or the navigation system map data
is outdated.
— When route guidance is switched on, the
system adapts to the route provided by the
navigation system. Driving without route
guidance or leaving a route can result in
faulty control.
D_ In certain countries
Audi adaptive cruise
control
General information
Applies to: vehicles with Audi adaptive cruise control
Depending on vehicle equipment, Audi adaptive
cruise control may consist of the following func-
tions:
Within the limits of the system, the adaptive
speed
and distance control assists the driver in
controlling the speed and the set distance to the
vehicle driving ahead. If the system detects a ve-
hicle driving ahead, the adaptive cruise control
can brake and accelerate your vehicle within the
limits of the system. On open roads with no traf-
fic, it functions like a cruise control system. The
stored speed is maintained. When approaching a
vehicle driving ahead, the adaptive cruise control
system automatically brakes to match that vehi-
cle's speed and then maintains the set distance
as much as possible. As soon as the system does
not detect a vehicle driving ahead, adaptive
cruise control accelerates up to the stored speed.
In stop-and-go traffic, the vehicle may brake to a
full stop and then may also start driving again
automatically under certain conditions.
Applies to: vehicles with traffic jam assist: In
traffic jams or in stop-and-go traffic, the traffic
jam assist can assist the driver to stay within the
lane detected by the system > page 134.
Applies to: vehicles with efficiency assist: Predic-
tive control can adjust the set speed based on
traffic and road conditions > page 126.
ZA WARNING
Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
G) Tips
For an explanation on conformity with the
FCC regulations in the United States and the
Industry Canada regulations, see > page 275.
127
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Driver assistance
Limitat
Applies to: vehicles with Audi adaptive cruise control
B8V-0630
Fig. 111 Example: vehicle changing lanes and stationary
vehicle
B4M-0093
Fig. 112 Example: driving into a curve
In some situations, the adaptive cruise control
function is limited and you must assume control
of the vehicle when necessary, for example by ap-
plying the brakes.
— When driving into a curve > fig. 112 and out of
acurve, the system may react to a vehicle in the
neighboring lane and apply the brakes. You can
override the system by pressing the accelerator
pedal briefly.
— The system works with the various sensors and
cameras in the vehicle. Vehicles can only be de-
tected once they are within the area and range
covered by the sensors > page 115, fig. 104.
— When driving around tight curves, a vehicle
driving ahead that was previously detected may
no longer be detected, and the system may ac-
celerate unexpectedly.
— The system does not react to a stationary vehi-
cle in the same lane if it expects that you can
easily drive around the stationary vehicle by
turning the steering wheel.
128
— The system cannot react to stationary objects,
such as vehicles at the end of a traffic jam, es-
pecially when traveling at high speeds.
— The system has a limited ability to detect
vehicles that are a short distance ahead, off to
the side of your vehicle, or moving into your
lane.
— Objects that are difficult to detect, such as mo-
torcycles, vehicles with high ground clearance,
or vehicles with an overhanging load, may be
detected late or not detected at all.
— The system does not respond to people, ani-
mals, or objects that are crossing or approach-
ing from the opposite direction.
ZA\ WARNING
Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
Fig. 114 Instrument cluster: driver assistance display
Indicator lights and messages in the speedome-
ter inform you about the driving situation
and the settings. In the Driver assistance display
(4) - @, you can find more detailed information
abour the system. The displays depend on the
country and equipment.
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Driver assistance
Display in the speedometer
@ Marking for the set speed
@ Current vehicle speed
@®) Available speed range for the adaptive cruise
control (example)
Image in the Driver assistance display
The display only appears when the Driver assis-
tance display is open in the on-board computer
> page 15.
Messages and settings
Detected vehicle driving ahead
Set target distance
If you fall below the set distance, the dis-
tance bars turn red from the bottom upward.
Your vehicle
Availability of Audi active lane assist
OOO
COO®
Availability of traffic jam assist
Indicator lights
BA - The speed/distance control is active. No
vehicles were detected ahead. The stored speed
is maintained.
B- The speed/distance control is active. A vehi-
cle was detected ahead. The system controls the
speed and distance from the vehicle driving
ahead, and accelerates and brakes automatically.
Al - The speed/distance control is active but the
vehicle is not ready to drive. A vehicle was de-
tected ahead. Your vehicle is stationary and will
not start driving automatically.
B - The speed/distance control is active but the
vehicle is not ready to drive. No vehicles were de-
tected ahead. Your vehicle is stationary and will
not start driving automatically.
A - The automatic braking is not enough to
maintain a sufficient distance to a vehicle driving
ahead. You must intervene > page 133, Driver in-
tervention request.
ZX WARNING
Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
Operating Audi adaptive cruise control
Applies to: vehicles with Audi adaptive cruise control
[RAZ-0096
B4M-0232
Fig. 116 Operating lever: changing the speed
Switching on
> To switch on the adaptive cruise control, pull
the lever up to position @ until it engages.
Storing the speed and activating regulation
If you have switched the system on, you can set
the current speed as the “regulated speed” and
activate regulation:
> Press the [SET] button (2). The set speed is indi-
cated with a marking in the speedometer (@)
=> page 128, fig. 113 and shown in the instru-
ment cluster > /\.
> To save the speed while the vehicle is station-
ary, also hold the brake pedal down.
129
>
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Driver assistance
— If you switch the ignition or the adaptive
cruise control system off, the set speed is
erased for safety reasons.
— When adaptive cruise control is switched
on, the ESC and ASR automatically switch
on.
— The system cannot be switched off or it may
be interrupted if the road exceeds the maxi-
mum possible grade for safe operation.
Setting the distance
Applies to: vehicles with Audi adaptive cruise control
B4M-0234
Fig. 117 Operating lever: setting the distance
If you adjust the speed, you must also change the
time gap to the vehicle driving ahead. The higher
the speed, the greater the distance that is need-
ed.
> Tap the rocker switch to display the distance
that is currently set.
> To increase or decrease the distance in incre-
ments, tap the switch again toward @) or G).
The newly-set distance will be shown briefly, for
example with the indicator light. In the Driv-
er assistance display, a graphic display is shown
instead of the indicator lights > page 128,
fig. 114. The display matches the functions of
the indicator lights.
When approaching a vehicle driving ahead, the
adaptive cruise control system brakes to match
that vehicle's speed and then adjusts to the set
distance. If the vehicle driving ahead accelerates,
then the adaptive cruise control will accelerate
up to the speed that you have set.
The following distances can be set:
Meaning
The time between is approximately 1
eee second. This setting corresponds toa
= distance of approximately 92 feet (28
m) when traveling at 62 mph (100
km/h).
The time between is approximately 1.3
seconds. This setting corresponds toa
distance of approximately 118 feet (36
m) when traveling at 62 mph (100
km/h).
The time between is approximately 1.8
seconds. This setting meets the general
recommendation of “half the speed
shown on the speedometer”. This cor-
responds to a distance of approximate-
ly 164 feet (SO m) when traveling at
62 mph (100 km/h).
The time between is approximately 2.4
seconds. This setting corresponds to a
distance of approximately 219 feet
(67 m) when traveling at 62 mph (100
km/h).
The time between is approximately 3.6
seconds. This setting corresponds toa
distance of approximately 328 feet
(100 m) when traveling at 62 mph (100
km/h).
i)
1D
Z\ WARNING
Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
G@) Tips
— When setting the distance, the driver is re-
sponsible for adhering to any applicable le-
gal regulations.
— Depending on the selected driving program
and distance, driving behavior when acceler-
ating may vary from moderate to sporty
=> page 133, Adjusting adaptive cruise con-
trol.
— The distances provided are specified values.
Depending on the driving situation and how
the vehicle ahead is driving, the actual >
131
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Driver assistance
B - Traffic jam assist switches off if the driver
does not take over steering after multiple driver
intervention requests. The system brakes the ve-
hicle until it is stationary.
Steering intervention request
If no steering activity is detected or the steering
power from the system is not sufficient, the driv-
er steering intervention request will alert the
driver using audio and visual signals. Take over
the steering and keep your hands on the steering
wheel so that you will be ready to steer at any
time.
If the driver does not take over steering, adaptive
cruise control (with traffic jam assist) will be
switched off. The system brakes the vehicle until
it is stationary.*
ZA WARNING
— Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras © page 114.
— The activated traffic jam assist is only an as-
sist system, and the driver is still responsi-
ble for controlling the vehicle. The driver is
especially responsible for braking, steering,
starting to drive, and controlling the speed
and the distance from other vehicles.
— Turn on the traffic jam assist only if the sur-
rounding conditions permit it. Always adapt
your driving style to the current visual,
weather, road, and traffic conditions.
— Switch the traffic jam assist off temporarily
when driving in turning lanes or highway ex-
its. This prevents the vehicle from accelerat-
ing to the stored speed when in these situa-
tions.
G) Tips
— Always keep your hands on the steering
wheel. The driver is always responsible for
adhering to the regulations applicable in
the country where the vehicle is being oper-
ated.
— Pay attention to applicable local regulations
relating to driving tasks, leaving space for
emergency vehicles, etc. The driver is always
responsible for following the laws that are
applicable in the location where the vehicle
is being operated.
— If traffic jam assist was deactivated through
the MMI, you can continue operating the
Audi active lane assist using the > fig. 121
button > page 137. The traffic jam assist
functions are no longer available.
— You are not necessarily guided to the center
of your lane.
Messages
Applies to: vehicles with traffic jam assist
If or |i is displayed when there is a mal-
function, the traffic jam assist functions may be
unavailable or may be limited.
A message that indicates the cause and possible
solution may appear with some displays. The
weather conditions may be too poor or a sensor
may be covered. Clean the area in front of the
sensors > page 116, fig. 106 and try to turn on
the systems again later.
If the malfunction remains, drive to an author-
ized Audi dealer or authorized Audi Service Facili-
ty immediately to have the malfunction correct-
ed.
135
Page 142 of 296
Driver assistance
— It has only been several seconds since the
ignition was switched on Th indicator
light turns on.
— When driving in reverse
— The front passenger's airbag is switched
off
— There is an airbag control module mal-
function
— System functions may not be available if
the ESC is limited or switched off, or if
there is a malfunction.
PN eye
Applies to: vehicles with Audi pre sense basic
Audi pre sense basic is automatically active at
speeds of approximately 20 mph (30 km/h) and
higher. The system can trigger the Audi pre sense
preemptive safety measures during emergency
braking and dangerous braking maneuvers as
well as in unstable driving situations, such as
oversteering or understeering.
ZA WARNING
Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
Audi pre sense front
Applies to: vehicles with Audi pre sense front
The Audi pre sense front system uses the data
from the radar sensors and calculates the proba-
bility of a rear-end collision. Within the limits of
the system, an impending collision with the front
of the vehicle can be detected in both urban and
rural speed ranges.
Early warning/acute warning
The system can recognize various dangerous sit-
uations. The early warning occurs if:
— Avehicle driving ahead brakes suddenly
— Your own vehicle approaches a significantly
slower vehicle or stationary vehicle in the direc-
tion of travel
The message Audi pre sense [@) or Audi pre
sense wa and a warning tone will warn you about
the danger.
140
If there is an impending collision with vehicles,
there may also be an acute warning in the form
of sharp braking. You will also be warned by an
indicator in the instrument cluster display. When
this warning occurs, it may only be possible to
avoid a collision by swerving or braking strongly.
Automatic deceleration
If you do not react to the acute warning, Audi pre
sense can brake the vehicle to a full stop within
the limits of the system if the vehicle is traveling
at low speeds. This reduces the vehicle speed in
the event of a collision.
Automatic braking force increase
If Audi pre sense determines that you are not
braking strongly enough when a collision is immi-
nent, it can increase the braking force based on
the situation.
Z\ WARNING
— Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
— Audi pre sense front cannot overcome natu-
ral physical laws. It is a system designed to
assist and it cannot prevent a collision in ev-
ery circumstance. The driver must always in-
tervene. The driver is always responsible for
braking at the correct time. Do not let the
increased safety provided tempt you into
taking risks. This could increase your risk of
a collision.
— Audi pre sense front does not react to cer-
tain objects, such as people/cyclists, ani-
mals, crossing or oncoming vehicles, bars,
railings, or railcars.
— Audi pre sense front may be limited or un-
available when driving in curves.
— Loose objects can be thrown around the ve-
hicle interior during sudden driving or brak-
ing maneuvers, which increases the risk of
an accident. Store objects securely while
driving.
G) Tips
Certain pre sense front functions will switch
off when the ESC is restricted or switched off >
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Driver assistance
= page 110, when there is a malfunction, or
when the hill hold assist* is switched on
= page 105.
Ne Cea ial
Applies to: vehicles with Audi pre sense city
Audi pre sense city uses data from the camera
and calculates within the limits of the system the
probability of a collision with vehicles and pedes-
trians.
Audi pre sense city is active at speeds of approxi-
mately 6 mph (10 km/h) and higher.
It can warn about pedestrians at speeds up to ap-
proximately 50 mph (85 km/h) and vehicles at
speeds up to approximately 155 mph (250
km/h).
Automatic deceleration is possible at speeds up
to 50 mph (85 km/h).
Early warning/acute warning
The system can recognize various dangerous sit-
uations. The early warning occurs if:
— Avehicle driving ahead brakes suddenly
— Your own vehicle approaches a vehicle in front
of you that is traveling at a significantly slower
speed or that is stationary
— A pedestrian is standing in the lane or is mov-
ing into the lane
A warning tone and the message Audi pre
sense Bo or Audi pre sense wB (depending on ve-
hicle equipment) will warn you about the danger.
If there is an impending collision with vehicles,
there may also be an acute warning in the form
of sharp braking. You will also be warned by an
indicator in the instrument cluster display. When
this warning occurs, it may only be possible to
avoid a collision by swerving or braking strongly.
Automatic deceleration
If you do not react to the acute warning, Audi pre
sense can brake the vehicle to a full stop within
the limits of the system if the vehicle is traveling
at low speeds. This reduces the vehicle speed in
the event of a collision.
Automatic braking force increase
If Audi pre sense determines that you are not
braking strongly enough when a collision is immi-
nent, it can increase the braking force based on
the
situation.
Z\ WARNING
— Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
— Audi pre sense city cannot overcome natural
physical laws. It is a system designed to as-
sist and it cannot prevent a collision in every
circumstance. The driver must always inter-
vene. The driver is always responsible for
braking at the correct time. Do not let the
increased safety provided tempt you into
taking risks. This could increase your risk of
a collision.
— Audi pre sense city does not react to certain
objects, such as animals, crossing or oncom-
ing vehicles, bars, railings, or railcars.
— Audi pre sense city may be limited or un-
available in curves or when it is dark.
— Loose objects can be thrown around the ve-
hicle interior during sudden driving or brak-
ing maneuvers, which increases the risk of
an accident. Store objects securely while
driving.
@) Tips
Certain pre sense front functions will switch
off when the ESC is restricted or switched off
= page 110, when there is a malfunction, or
when the hill hold assist* is switched on
=>page 105.
ONC t Le
Applies to: vehicles with Audi pre sense rear
Within the limits of the system, Audi pre sense
rear uses data from radar sensors in the rear area
of the vehicle and calculates the probability of a
rear-end collision with the vehicle behind you.
Audi pre sense preemptive safety measures can
be initiated if the risk of a collision with the vehi-
cle behind you is detected.
141
>