2020 AUDI A4 brake sensor

8W1012721BB
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

Driver assistance

distance may be more or less than these tar-
get distances.
Overriding control
Applies to: vehicles with Audi adaptive cruise control

RAZ-0096


Fig. 118 Operating lever: decreasing the distance
Requirement: adaptive cruise control must be
switched on.
Overriding control
You can completely override the control, for ex-
ample when passing or if you would like to accel-
erate more quickly.
> To accelerate manually, pull the lever toward
you in the direction of the arrow and hold it
there, or press the accelerator pedal.
> To resume the usual cruise control, release the
lever or remove your foot from the accelerator
pedal.
When you are in the Driver assistance display,
the message Overridden will appear.
Decreasing the distance
The function decreases the set distance and pro-
vides assistance, for example when merging
when a lane is ending.
> To further reduce the distance to the vehicle
ahead temporarily, pull the lever toward your-
self in the direction of the arrow and hold it in
that position.
> To resume the system control, release the lever.
The adaptive cruise control reduces the distance
and, if necessary, accelerates the vehicle above
the set speed.
132


Z\ WARNING
— Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
— Resting your foot on the accelerator pedal
could override the cruise control. Braking in-
terventions and corrective actions by the
system may not occur.

Driving in stop-and-go traffic
Applies to: vehicles with Audi adaptive cruise control
RAZ-0398
Applies to: vehicles with safe start monitor
Fig. 119 Instrument cluster: safe start monitor
Stopping with adaptive cruise control
The adaptive cruise control system also assists
you in stop-and-go traffic. Within the limits of
the system, your vehicle may brake and remain at
a stop if a vehicle driving ahead stops.
Starting to drive with adaptive cruise control
As long as the message | ready to drive and Aa
is displayed, your vehicle will begin driving when
the vehicle ahead starts to move > /\.
If you are stopped for several seconds, your vehi-
cle will no longer drive autonomously for safety
reasons, and the message will turn off.
> To extend a ready to drive mode for several
seconds or reactivate, pull the lever briefly to-
wards you in the direction of the arrow
=> page 132, fig. 118.
> To resume manual control of the vehicle, tap
the accelerator pedal.
Safe start monitor
Applies to: vehicles with safe start monitor
The vehicle can still start to drive even if certain
obstacles are detected when starting to drive
=> /\. For example, if an obstacle is detected by >

8W1012721BB
Driver assistance

the sensors or cameras, the A indicator light The request for driver intervention instructs you
will warn you of the danger. to take over if the adaptive cruise control braking
function is not able to maintain a sufficient dis-
tance to the vehicle driving ahead. The system
will warn you of the hazard with the A indicator
light and the message Distance!. An audio signal
will also sound.
If you are in the Driver assistance display, the
display @) © fig. 119 and the message Warning!
will also appear. An audio signal will also sound.
Your vehicle will drive more slowly when starting.
This may also occur in some situations when


there is no apparent obstacle. The display @ only appears when the Driver as-
> Press the brake pedal to slow your vehicle sistance display is open in the on-board comput-
er > page 15.
down.
ZA\ WARNING
ZA WARNING
Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
— Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
— If the message BS ready to drive!) appears,
your vehicle will start driving even if there is CE Tere Tac
- Applies to: vehicl ith Audi adapti i trol
an obstacle between your vehicle and the ve- PP ISS ROS MENICIES REE AMEL 2lapenercrutseiconnr
hicle ahead. To reduce the risk of an acci- You can adjust the system individually. The set-
dent, always make sure there are no obsta- tings depend on the vehicle equipment.
cles between your vehicle and the vehicle
driving ahead.

> Applies to: MMI: Select on the home screen:
VEHICLE> Driver assistance > Audi adaptive
@ Tips cruise control.
For safety reasons, the adaptive cruise control Possible settings:
will only be active if

Applies to: vehicles without Audi drive select
Driving program - Depending on the selected
driving program and distance, the vehicle han-
dling will be adjusted from Sport to Moderate.
—The driver's safety belt is fastened
— All doors and the hood are closed
— Your vehicle is not stopped for a long period
of time
Applies to: vehicles with Audi drive select
Driver intervention request Vehicle handling will be adjusted based on the
Applies to: vehicles with Audi adaptive cruise control set distance and the selected Audi drive select
mode > page 106.

RAZ-0399)
Store last distance - The last distance that was
set will be stored after the ignition is switched
off. If the distance is not stored, distance
(time distance of approximately 1.8 seconds) is
automatically preset every time the ignition is
switched on.

Fig. 120 Instrument cluster: request for driver interven-
tion

D_ This is not available in some countries.
133

Driver assistance

Predictive control - When predictive control is
switched on, the system reacts automatically to
situations > page 126.
@ Tips
Certain settings are automatically stored and
assigned to the remote control key being
used.
Messages
Applies to: vehicles with Audi adaptive cruise control
If Or fied is displayed when there is a mal-
function, the adaptive cruise control or 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.

Please take over!
This message appears if the vehicle rolls back
when starting ona slight incline, even though the
systems are active. Press the brake pedal to pre-
vent the vehicle from rolling or starting to move.
Traffic jam assist
Applies to: vehicles with traffic jam assist

B8V-0692


Fig. 121 Turn signal lever: button for traffic jam assist and
Audi active lane assist
134
Traffic jam assist supports the driver when driv-
ing in traffic jams or in heavy traffic.
In a speed range under 40 mph (65 km/h), the
system can help to keep the vehicle within a lane
calculated by the system. Within the limits of the
system, the system controls the steering auto-
matically when adaptive cruise control is switch-
ed on. Since traffic jam assist is only an assist
system, the driver must always keep his or her
hands on the steering wheel and be ready to
steer. The driver can override the control at any
time by actively steering.
The system is designed for driving on express-
ways and highways.
Requirements for using traffic jam assist:
> The traffic jam assist is preselected in the MMI
settings: Select on the home screen: VEHICLE >
Driver assistance > Traffic jam assist.
> Adaptive cruise control must be switched on
and active > page 129.
If you open the Driver assistance display in the
on-board computer > page 15, the indicator
light and the message Traffic jam assist availa-
ble will turn on when a traffic jam is detected.
Activating or deactivating traffic jam assist
> To activate or deactivate traffic jam assist,
press the > fig. 121 button.
Always switch off traffic jam assist in the
following situations:
— When increased attention is needed from the
driver
— In construction zones
— In city driving
— On stretches of road with curves
—In unclear traffic situations such as at intersec-
tions or toll stations
Indicator lights
Traffic jam assist is available.
B and B - traffic jam assist is switched on.
Vehicles driving ahead were detected. Your vehi-
cle adapts while driving.

8W1012721BB
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

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 >

8W1012721BB
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
>

Parking and maneuvering

forward faster than approximately 6 mph (10
km/h).

ZA\ WARNING
Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 114.
@) Note
Keep enough distance from the curb to avoid
damage to the rims.
G) Tips
— If the parking aid is switched off, it can only
be reactivated automatically when one of
the following conditions is met:
— The vehicle speed exceeds 6 mph (10 km/h)
— The ignition was switched off and back on
again
— The parking brake was set and then released
— The “P” gear was engaged and released
again


Applies to: vehicles with parking aid plus

Fig. 129 Center display: distance display
If the sensors detect an obstacle, audible and vis-
ual signals will warn you.
Visual warnings
The visual warnings in the center display help you
to detect the critical vehicle area and to estimate
the distance to an obstacle.
Red segments (2) show detected obstacles that
are in your vehicle's path. The red lines 2) mark
the expected direction of travel based on the
steering angle. A white segment (8) indicates a
detected obstacle that is outside of the vehicle's
148
path. The closer your vehicle comes to the obsta-
cle, the closer the segments will move to the ve-
hicle. The collision area has been reached when
the next to last segment is displayed. Obstacles
in the collision area, including those outside of
the vehicle's path, are shown in red. Do not con-
tinue driving farther.
Audio signals
The closer your vehicle gets to a detected obsta-
cle, the shorter the time between the audible sig-
nals. A continuous tone sounds when an obstacle
is less than approximately 1 foot (0.30 m) away
from the front or rear of the vehicle. A continu-
ous tone sounds when an obstacle is less than
approximately 0.7 feet (0.20 m) away from the
sides* of the vehicle. Do not continue driving for-
ward or in reverse >@).
> To deactivate audio signals while parking, press
(Jin the center display. The audio signals will
be automatically activated again the next time
the parking aid is activated.
Adjusting the volume
You can adjust the volume to your preferences.
The settings depend on the vehicle equipment.
> Applies to: MMI: Select on the home screen:
VEHICLE > Parking aid. Or:
> Press L-] in the center display when the parking
aid is active.


Possible settings:
Front volume - Volume for the front and side*
area.
Rear volume - Volume for the rear area.
Entertainment fader - The volume of the audio/
video source is lowered when the parking aid is
activated.
The new level is demonstrated briefly* when the
volume is adjusted.
Error messages
If P4 appears, the sensor in the respective area
or the speaker is faulty. Drive immediately to an
authorized Audi dealer or authorized Audi Service
Facility to have the malfunction repaired.