2021 AUDI S4 brake sensor

Quick access

Brake system
=> page 105,
=> page 229,
Electromechanical parking brake
=> page 107
Electromechanical parking brake
=> page 106
Electromechanical parking brake
=> page 106
Steering
>page 111
Steering lock
>page 111
Adaptive cruise control
=> page 131,
Safe start monitor
> page 136,
Driver intervention request
=> page 137
Traffic jam assist
=> page 138
Steering intervention request
=>page 139
Distance warning
=> page 140
Active lane assist
=> page 141
Pre sense
> page 144
Hood
=> page 222
Engine oil pressure
=> page 224
Engine oil level (MIN)
=> page 224
Electrical system
= page 230

Yellow indicator lights
Central indicator light
=> page 7
Engine speed limitation
=>page 14



























Engine speed limitation
> page 14,
Drive system
= page 102
Central locking
=> page 35
Bulb failure indicator
=> page 54
Adaptive light
=> page 54
Headlight range control system
> page 54
Light/rain sensor
=> page 54,
=> page 60
Windshield wipers
=> page 60
Safety systems
=> page 72
Engine start system
=> page 96
Convenience key
=> page 96
Transmission
=> page 100
Brake system
=>page 105
Electromechanical parking brake
=> page 107
Suspension control
> page 111
Steering
=> page 111
Steering lock
>page 111
All wheel drive
> page 112,
Sport differential
> page 112
Electronic Stabilization Control
(ESC)
=>page 114

Driver assistance

An additional indicator appears in the head-up
display*.
Changing the cruise control speed
Applies to: vehicles with cruise control system
Requirement: the system must be switched on.
> To increase or decrease the cruise control speed
in small increments, tap the lever up to the
first level toward @)/G) > page 127, fig. 105.
> To increase or decrease the cruise control speed
in larger increments, tap the lever up to the
second level toward @)/G).
> To increase or decrease the cruise control speed
continuously, tap and hold the lever at the first
or second level toward @)/G).
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 the regulated speed must be activated.
Overriding
> To temporarily override the cruise control
speed, press the accelerator pedal.
> To resume the stored regulated speed, remove
your foot from the accelerator pedal.
If you override the cruise control system for a
long period of time, the cruise control system
will be deactivated. The [Ud or [RM indicator
light will be displayed and the cruise control
speed will be saved.
Deactivating
> To deactivate the cruise control speed, press
the lever toward @) (not locked into place)
=> page 127, fig. 105, or
> Press the brake pedal.
128

ZA WARNING
Resting your foot on the accelerator pedal
could override the cruise control. This will pre-
vent braking interventions by the system.
See me Lai
Applies to: vehicles with cruise control system

When you switch the system off, the cruise con-
trol speed will be erased.
Requirement: the system must be switched on.
> To switch the system off, press the lever toward
@ (locked into place) > page 127, fig. 105, or
> Switch the ignition off.
Applies to: vehicles with cruise control system
Gir / 3) 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 129.
— Predictive control > page 133.

Driver assistance


switched on. The driver is always responsible
for assessing the traffic situation.
@ Tips
— 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.
— When a route is planned using the naviga-
tion system*, then system displays messag-
es based on an assumed route. Without
route guidance, the system displays mes-
sages based on an assumed route.
— The wording of the message may vary de-
pending on the selected Audi drive select*
mode and the selected gear.

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
130
jam assist can assist the driver to stay within the
lane detected by the system > page 138.
Applies to: vehicles with efficiency assist: Predic-
tive control can adjust the set speed based on
traffic and road conditions > page 133.

Z\ WARNING
Observe the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 117.
@) Tips
The system complies with United States FCC
regulations and ISED regulations > page 284.

Applies to: vehicles with Audi adaptive cruise control



Fig. 106 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. 106 and out of
a curve, 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 118, fig. 99.
— 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.

8W1012721BC
Driver assistance

— The system does not react to a stationary vehi- @ - @, you can find more detailed information
cle in the same lane if it expects that you can about the system. The displays depend on the
easily drive around the stationary vehicle by country and equipment.
turning the steering wheel.
— The system cannot react to stationary objects, Display th thespeedsmeter
such as vehicles at the end of a traffic jam, es- @ Marking for the set speed
pecially when traveling at high speeds. @ Current vehicle speed
— The system has a limited ability to detect © Available speed range for the adaptive cruise
vehicles that are a short distance ahead, off to control (example)
the side of your vehicle, or moving into your
iane: Image in the Driver assistance display
— Objects that are difficult to detect, such as mo- The display only appears when the Driver assis-
torcycles, vehicles with high ground clearance, tance display is open in the on-board computer
or vehicles with an overhanging load, may be > page 16.
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.
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.

ZA WARNING
Observe the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 117. Your
vehicle
Availability of Audi active lane assist
©O©©OQ®
COG®
Availability of traffic jam assist


Indicator lights
BI alo A - The speed/distance control is active. No
Applies to: vehicles with Audi adaptive cruise control

vehicles were detected ahead. The stored speed
is maintained.
RAZ-0205. a - 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.
A - 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. BI 3 9) nN | fac 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.
aA - The automatic braking is not enough to
maintain a sufficient distance from a vehicle driv-
Fig. 108 Instrument cluster: driver assistance display ing ahead. You must intervene > page 137, Driv-
er intervention request. >

Indicator lights and messages in the speedome-
ter @ -@ inform you about the driving situation
and the settings. In the Driver assistance display
131

Driver assistance


ZA\ WARNING
Observe the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 117.
Operating Audi adaptive cruise control
Applies to: vehicles with Audi adaptive cruise control


RAZ-0096

B4M-0232



Fig. 110 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 131, fig. 107 and shown in the instru-
ment cluster > A\.
> To save the speed while the vehicle is station-
ary, also hold the brake pedal down.


D_ Analog instrument cluster: 20 mph (30 km/h)
2) Depends on the country and engine
132
You can set any speed between 15 mph
(20 km/h)» and the maximum possible speed
range @)?) > page 131, fig. 107.
Pausing cruise control
The control can be stopped at any time:
> While driving or when the vehicle is stationary:
Press the lever away from you in the direction
of the arrow. Or
» While driving: Press the brake pedal.
The Ba indicator light turns off.
Resuming regulation
The previously set speed can be resumed at any
time after a pause.
> To resume cruise control while driving, pull the
lever toward you in the direction of the arrow.
> To resume cruise control when stationary, pull
the lever toward you in the direction of the ar-
row while pressing the brake pedal.
Changing the speed
> To increase or decrease the set speed in smaller
increments, briefly tap the lever toward G) or
© to the first level.
> To increase or decrease the set speed in larger
increments, briefly tap the lever toward () or
© to the second level.
> To increase or decrease the set speed quickly,
hold the lever toward @) or () until the mark-
ing in the speedometer @) page 131, fig. 107
has reached the desired speed.
Applies to: vehicles with efficiency assist: Predic-
tive control can automatically adjust the set
speed based on traffic and road condi-
tions > page 133.
Preselecting a speed
You can also preselect the speed when adaptive
cruise control is not active by moving the lever in
the desired direction @)/@). Activate the previ-
ously selected speed by pulling the lever toward
you in the direction of the arrow.

8W1012721BC
Driver assistance

Switching off
If you do not want to use the adaptive cruise con-
trol for a long period of time, you can switch it
off.
> Push the lever away from you into position @)
until it clicks into place.
The indicator light and the set speed will turn off.

Z\ WARNING
— Observe the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 117.
— The activated adaptive cruise control is only
an assist system, and the driver is still re-
sponsible 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 adaptive cruise control only if
the surrounding conditions permit it. Always
adapt your driving style to the current visu-
al, weather, road, and traffic conditions.
— Switch adaptive cruise control off temporari-
ly when driving in turning lanes, on express-
way exits or in construction zones. This pre-
vents the vehicle from accelerating to the
stored speed when in these situations.
— If you press the [SET] button @) when driv-
ing at speeds below 15 mph (20 km/h)»,
the minimum possible speed that the sys-
tem can maintain will be set. If no vehicle is
detected ahead of you, the vehicle will accel-



erate up to that speed.

(i) Tips
— Always keep your hands on the steering
wheel so you can be ready to steer at any
time. The driver is always responsible for
adhering to the regulations applicable in
the country where the vehicle is being oper-
ated.

) Analog instrument cluster: 20 mph (30 km/h)
— 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.
Predictive control
Applies to: vehicles with Audi adaptive cruise control and effi-
ciency assist
With predictive control, efficiency assist adapts
the set speed in adaptive cruise control @
=> page 131, fig. 107 based on detected speed
limits and the upcoming route. Once the system
no longer detects any incidents ahead, adaptive
cruise control will accelerate back up to the last
speed that the driver set. After switching on the
ignition, the availability of predictive control is
indicated by a message when the adaptive cruise
control is first activated.
Incident symbols indicate the situation to which
predictive control is reacting > page 129, Situa-
tion symbols.
Requirements
— Predictive control is switched on in the MMI
=> page 137.
— Adaptive cruise control is actively regulating
=> page 132.
— The system can only react to speed limits that
are 15 mph (20 km/h)” or higher.
Overriding control
The driver can override the predictive control to
the route ahead at any time by pressing the ac-
celerator or brake pedal. If the system changes
the vehicle speed to adapt to speed limits, you
can change the speed using the lever
=> page 132, fig. 110.
133

Driver assistance

Messages
If and a message with Predictive control is
displayed when there is a malfunction, the effi-
ciency assist functions are unavailable or 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 119 and try to turn on the sys-
tems 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.

ZA WARNING
— Observe the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 117.
— Pay attention to traffic and the area around
your vehicle when predictive control is
switched on. The driver is always responsible
for assessing the traffic situation.
— The system does not consider “right of way”
rules and does not respond to traffic lights,
so lack of driver attention in these situations
can increase the risk of an accident.
— The speed when driving through curves may
be different from what you as a driver would
do or may not be suitable for the weather
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.

@ 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

D_ In certain countries
134
applicable in the country where the vehicle
is being operated.
— Ifa speed limit is detected, the marking @
= page 131 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.
Setting the distance
Applies to: vehicles with Audi adaptive cruise control


B4M-0234


Fig. 111 Operating lever: setting the distance
If you adjust the speed, you must also change the
time gap to the vehicle driving ahead. The higher >

8W1012721BC
Driver assistance

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 ().
The newly-set distance will be shown briefly, for
example with the [eg indicator light. In the Driv-
er assistance display, a graphic display is shown
instead of the indicator lights > page 131,
fig. 108. 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:

Sym-
bol
Meaning

The time between is approximately 2.4
seconds. This setting corresponds toa
distance of approximately 219 feet
(100 m) when traveling at 62 mph
(67 m/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 m/h).
D
1D



Z\ WARNING
Observe the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 117.


Meaning

The time between is approximately 1
second. This setting corresponds toa
distance of approximately 92 feet
(100 m) when traveling at 62 mph
(28 m/h).
The time between is approximately 1.3
seconds. This setting corresponds toa
distance of approximately 118 feet
(100 m) when traveling at 62 mph
(36 m/h).
nD
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).
(i) 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 137, 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 dis-
tance may be more or less than these target
distances.
Overriding control
Applies to: vehicles with Audi adaptive cruise control



[RAZ-0096


Fig. 112 Operating lever: decreasing the distance
135