brake AUDI A8 2020 Service Manual

Driver assistance


as well as the vehicle's surroundings with di-
rect eye contact.
— The system may not react if vehicles are ap-
Proaching very fast.
@ Tips
For an explanation on conformity with the
FCC regulations in the United States and the
Industry Canada regulations, see > page 339.


Emergency assist
Applies to: vehicles with emergency assist
General information
Within the limits of the system, the emergency
assist detects if the driver is inactive. In these in-
stances, the system warns the driver, assumes
control of the vehicle if necessary, and brings the
vehicle automatically to a stop in the lane.
Regardless of the speed, the emergency assist is
automatically available when the adaptive cruise
assist* is activated. When the adaptive cruise as-
sist® is deactivated, the system is only active at
speeds higher than approximately 40 mph
(65 km/h).
Emergency assist functions
Within the limits of the system, the emergency
assist monitors the driver’s steering, accelerator,
and brake pedal activity. Depending on the se-
verity of the situation, it may initiate visual, au-
dio, and haptic warnings in stages:
— Reduces the speed
— Messages
— Lowers the volume of the Infotainment system
— Audible warning
— Tightening of the safety belt
—A brief application of the brakes

D_ This function is not available in every market and on all ve-
hicle equipment levels.
190
If the driver remains inactive despite the warn-
ings, the emergency assist controls the vehicle
within the limits of the system:
— The Audi pre sense preemptive safety measures
are triggered > page 182.
— The vehicle will stay in the lane and will be
braked to a stop.
— As soon as the vehicle comes to a full stop, the
emergency flashers are activated and the vehi-
cle prepares for the vehicle passengers to be
rescued. The parking brake is set, “P” gear is
engaged, the doors are unlocked, and the inte-
rior lighting is activated. If there is no move-
ment for several seconds, the emergency call ))
will be made if necessary.
Overriding the emergency assist
You can override the emergency assist > A\:
— Move the steering wheel. Or
— Press the brake pedal. Or
— Press the accelerator pedal distinctly.
When stationary, you can end the emergency as-
sist by leaving the "P" position or releasing the
parking brake > page 124.
Switching the emergency assist on and off
The system can be switched on and off in the
MMI ®& page 157.
Messages
1f E or EB is displayed when there is a malfunc-
tion, the emergency assist functions may be un-
available 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 156 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.

4N0012721BD
Parking and maneuvering


ZA\ WARNING
Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 154.
@) Note
Keep enough distance from the curb to avoid
damage to the rims.
@) Tips
— Certain settings are stored automatically in
the active personal profile.
— If the parking aid is deactivated, 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 is switched off and back on
again
— The parking brake is set and then released
—The “P” gear is engaged and released
again
Applies to: vehicles with parking system plus

Fig. 146 Upper display: distance indicator
If the sensors detect an obstacle, audible and vis-
ual signals will warn you.
Visual warnings
The visual warnings in the upper display help you
to detect the critical vehicle area and to estimate
the distance to an obstacle.
Red segments (4) 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 (3) indicates a
detected obstacle that is outside of the vehicle's
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. Do not con-
tinue driving forward or in reverse >(@).
> To deactivate audio signals while parking, press
«Jin the upper display. The audio signals will be
automatically activated again the next time the
parking system 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 |---| in the upper display when the parking
system is active.


Possible settings:
Front volume - Volume for the front area.
Rear volume - Volume for the rear area.
Entertainment fader - The volume of the audio/
video source is lowered when the parking system
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.
If Avis displayed in the MMI, the ultrasonic sen-
sor indicated is icy or dirty. Clean the area in front
of the sensors > page 156. >
193

Parking and maneuvering


A WARNING
— Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 154.
— The Surroundings and 3D surroundings are
created from the individual camera images.
The vehicle image is shown by the system.
Objects and obstacles above the camera are
not displayed.
@) Note
Only use the images provided by the camera
on the rear of the vehicle when the luggage
compartment lid is completely closed. Make
sure any objects you may have mounted on
the luggage compartment lid do not block the
rearview camera.
iG) Tips
— Depending on the selected gear, it will auto-
matically switch between the Front and
Rear views. If you switch the view manually,
the automatic front/rear camera change will
be temporarily deactivated.
— When first activated while a forward gear is
engaged, the Front corner is displayed.

Rear cross-traffic assist
Applies to: vehicles with rear cross-traffic assist
7]
s
g
= = a

Fig. 151 Sensor detection range for rear cross-traffic assist
198

Fig. 152 Upper display: rear cross-traffic assist display
General information
The rear cross-traffic assist monitors the area be-
hind and next to the vehicle using radar sensors
at the rear corners of the vehicle. The system can
detect moving objects that are approaching, such
as vehicles > fig. 151. A display in the MMI and
various warnings provide assistance when exiting
a parking space.
Requirements for using the rear cross-traffic
assist:
— Reverse gear must be engaged and the speed
while driving in reverse must not be higher than
6 mph (10 km/h).
Displays, warnings, and braking
— Display: the indicator @ in the upper display
only appears when the parking aid is activated.
In vehicles with peripheral cameras, the display
only appears in the Rear and Rear corner cam-
era views. Arrows show the direction from
which the cross traffic is approaching.
— Audible warnings: an audio signal may sound
as an additional warning when driving in re-
verse.
— Automatic brake activation: if you do not react
to a warning, a brief braking by the system can
warn you of a potential collision with an ap-
proaching object.
The audible warning signal and the automatic
brake activation occur only when driving in re-
verse.
Switch rear cross-traffic assist on and off
— Applies to MMI: Select on the home screen: VE-
HICLE > Parking aid > Rear cross-traffic assist.
Or

4N0012721BD
Parking and maneuvering


— Select |--| > Rear cross-traffic assist in the upper
display when the parking system is active.

Messages
re or > is displayed when there is a mal-
function, the rear cross traffic 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 sensor area in the ve-
hicle rear and try to turn the systems on 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.

Z\ WARNING
— Follow the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 154.
— The rear cross-traffic assist will not provide
alerts about people and cannot warn you
about every type of approaching objects,
such as cyclists. Always monitor the traffic
as well as the vehicle's surroundings with di-
rect eye contact.
— The system may not react if objects are ap-
proaching very quickly.
— The rear cross-traffic assist will not provide
alerts if your vehicle is parallel parked or if
your vehicle is pulled too far into the park-
ing space so that it is hidden by adjacent
vehicles.

@) Tips
— Certain settings are stored automatically in
the active personal profile.
— Once an automatic brake activation occurs,
the system cannot initiate another activa-
tion for several seconds.
— System functions may not be available if the
ESC is limited or switched off, or if there is a
malfunction.
— If there is an acoustic warning signal from
the rear cross-traffic assist, then the park-
ing system may not warn you of detected
obstacles under certain circumstances.
— For an explanation on conformity with the
FCC regulations in the United States and the
Industry Canada regulations, see
> page 339.
— The coverage areas of the sensors > fig. 151
are diagrams and do not represent a true-
to-scale image of the sensor ranges.
199

4N0012721BD
Checking and Filling

safety precautions provided in the following in-
formation. The engine compartment is a dan-
gerous area in the vehicle. > A.


ZA WARNING
— Turn the engine off.
— Switch the ignition off.
— Set the parking brake.
— Select the “P” (Park) selector lever position.
— Allow the engine to cool.
— Keep children away from the engine com-
partment.
— Never spill fluids on a hot engine. These flu-
ids (such as the freeze protection contained
in the coolant) can catch fire.
— Avoid short circuits in the electrical system.
— Never reach into the radiator fan. The fan is
temperature-controlled and can turn on
suddenly, even when the ignition is switched
off.
— Never open the hood when there is steam or
coolant escaping from the engine compart-
ment, because there is a risk that you could
be burned. Wait until no steam or coolant is
escaping.
— Plug-in hybrid drive: the coolant expansion
tank cap is equipped with a seal that must
never be removed under any circumstances
= page 277, fig. 183. If the coolant expan-
sion tank for the high-voltage system is not
sealed, please contact an authorized Audi
dealer or authorized Audi Service Facility.
— Plug-in hybrid drive: the sealed cap must on-
ly be opened by an authorized Audi dealer or
authorized Audi Service Facility.
— The cap on the coolant expansion tank must
never be opened when the coolant is hot.
The cooling system is under pressure. There
is a risk of burns
— To protect your face, hands, and arms from
hot steam or coolant, cover the cap with a
thick cloth when opening.
— Do not remove the engine cover under any
circumstances. This increases the risk of
burns.
— Due to the risk of electric shock, never touch
the ignition cable or other components in

the electronic high-voltage ignition system
when the engine is running or is starting.
— Ifa gear is engaged while the vehicle is sta-
tionary and the engine is running, do not
press the accelerator pedal inadvertently.
Pressing the accelerator pedal will cause the
vehicle to move, and this could result in an
accident.
— If inspections or repairs must be performed
while the engine is running, moving compo-
nents (such as the ribbed belt, generator,
and radiator fan) pose an additional risk.
— Set the parking brake first and select the
“P” (Park) selector lever position.
— Always make sure that no parts of the
body, jewelry, ties, loose clothing, and
long hair can be caught in moving engine
components. Before any work, always re-
move any jewelry and/or ties, tie back long
hair, and make sure all clothing fits close
to the body to reduce the risk of anything
becoming caught in engine components.
— Pay attention to the following warnings list-
ed when work on the fuel system or on the
electrical equipment is required.
— Do not smoke.
— Never work near open flames.
— Always have a working fire extinguisher
nearby.
— All work on the battery or electrical system
in your vehicle can result in injuries, chemi-
cal burns, accidents, or burns. Because of
this, all work must be performed only by an
authorized Audi dealer or authorized Audi
Service Facility.
— Limit your exposure to exhaust and chemi-
cals to as short a time as possible.


ZA\ WARNING
California Proposition 65 Warning:
— Engine exhaust, some of its constituents,
and certain vehicle components contain or
emit chemicals known to the State of Cali-
fornia to cause cancer and birth defects and
reproductive harm. In addition, certain flu-
ids contained in vehicles and certain prod-
ucts of component wear contain or emit

275

4N0012721BD
Checking and Filling
Engine compartment overview
The most important check points.




Fig. 183 Typical location of the reservoir and the engine oil filler opening (example)
Follow the safety precautions > page 274. G) Tips
@ Washer fluid reservoir (6) > page 287 Plug-in hybrid drive*: read the information re-
@ Jump start point (+) under a cover, (-) with garding the coolant expansion tank under
hex head screw > page 286, Charging the 12 => page 282 and the jump start under >@® in
Volt vehicle battery, > page 322, Jump start- Preparation on page 323.
ing
® Engine oil filler opening (387) 9 page 279 Engine oil
@ Brake fluid reservoir (O)
under a cover
© page 283
© Coolant expansion tank for combustion en- If you need to add engine oil, use an oil that is
gine (4) > page 282 listed on the sticker. The sticker is located at the
© Plug-in hybrid drive: coolant expansion tank front of the engine compartment > page 277,
for the high-voltage system ( page 282 fig. 183.
@ Sticker* for engine oil specifications
If the recommended engine oil is not available, in
=> page 277
an emergency you may add a maximum of 1
The engine oil filler opening may be located ina quart (1 liter) of ACEA C3 or API SN engine oil
different area depending on the specific engine. one time until the next oil change.
For more information on the correct engine oil
for your vehicle, contact an authorized Audi >
277

4N0012721BD
Checking and Filling

> Add coolant mixed in the correct ratio
=> page 281 up to the MAX marking.
> Make sure that the fluid level remains stable.
Add more coolant if necessary.
> Turn the cap to the right to tighten it until you
feel resistance a second time.
Coolant loss usually indicates that there is a leak.
Immediately drive your vehicle to an authorized
Audi dealer or authorized Audi Service Facility
and have the cooling system inspected. If the
cooling system is not leaking, coolant loss can re-
sult from the coolant boiling due overheating
and then being forced out of the cooling system.

voltage system is not sealed, please contact
an authorized Audi dealer or authorized
Audi Service Facility.
— When adding coolant, it may leak into the
inside of high-voltage components and
cause a short circuit, increasing the risk of


fire.


Z\ WARNING
— The engine compartment in any vehicle can
be a dangerous area. Stop the engine and al-
low it to cool before working in the engine
compartment. Always follow the informa-
tion found in > page 274, General informa-
tion.
— Never open the hood if you can see or hear
steam or coolant escaping from the engine
compartment. This increases the risk of
burns. The cooling system is under pressure.
When you no longer see or hear steam or
coolant escaping, you may open the engine
compartment with caution.
— When working in the engine compartment,
remember that the radiator fan can switch
on even if the ignition is switched off, which
increases the risk of injury.
— Coolant additive and coolant can be danger-
ous to your health. For this reason, store the
coolant in the original container and away
from children. There is a risk of poisoning.
() Note
Do not add coolant if the expansion tank is
empty. Air could enter the cooling system and
damage the engine. If this is the case, do not
continue driving. See an authorized Audi deal-
er or authorized Audi Service Facility for assis-
tance.
Brake fluid

BFV-0229|




ZA WARNING
Applies to: vehicles with plug-in hybrid drive
— The coolant expansion tank for the high-
voltage system may only be opened or filled
by an authorized Audi dealer or authorized
Audi Service Facility.
— The coolant expansion tank cap is equipped
with a seal that must never be removed un-
der any circumstances > page 277, fig. 183.
If the coolant expansion tank for the high-


Fig. 186 Engine compartment: cap on brake fluid reservoir
Follow the safety precautions > page 274, Gener-
al information.
Checking the brake fluid level
> Slide the cover that is located below the wind-
shield wipers on the driver's side toward the
windshield and remove the cover.
> Read the brake fluid level on the brake fluid res-
ervoir > page 277, fig. 183. The brake fluid lev-
el must be between the MIN and MAX markings
oA.
The brake fluid level is monitored automatically.
Message
GG / @ Brakes: stop vehicle and check brake
fluid level >
283

Checking and Filling

Stop the vehicle and check the brake fluid level.
See an authorized Audi dealer or authorized Audi
Service Facility for assistance.
Changing the brake fluid
Brake fluid should be changed at regular inter-
vals. Have the brake fluid changed by an author-
ized Audi dealer or authorized Audi Service Facili-
ty. The authorized Audi dealer or authorized Audi
Service Facility will inform you of the replace-
ment intervals.

Z\ WARNING
— If the brake fluid level is below the MIN
marking, it can impair the braking effect and
driving safety, which increase the risk of an
accident. Do not continue driving. See an au-
thorized Audi dealer or authorized Audi
Service Facility for assistance.
— If the brake fluid is old, bubbles may form in
the brake system during heavy braking. This
could impair braking performance and driv-
ing safety, which increases the risk of an ac-
cident.
— The brake fluid in your vehicle must meet
the standard VW 501 14 and is available at
an authorized Audi dealer or authorized
Audi Service Facility. If this brake fluid is not
available, another high-grade brake fluid of
equivalent quality may be used, and it must
meet the U.S. Federal Motor Vehicle Stand-
ard (FMVSS) 116 DOT 4, Class 6.

@) Note
— If the brake fluid level is above the MAX
marking, brake fluid may leak out over the
edge of the reservoir and result in damage
to the vehicle.
— Do not allow any brake fluid to come into
contact with the vehicle paint, because it
will corrode the paint.
Electrical system
If the = / B or = indicator light turns on,
there is a malfunction in the power supply, the
battery, or the vehicle electrical system.
284
= / B Electrical system: malfunction! Safely
stop vehicle
Do not continue driving and switch the ignition
off > A\. See an authorized Audi dealer or author-
ized Audi Service Facility for assistance.
= Electrical system: malfunction! Restart not
possible. Please contact Service
If you switch the ignition off, you will not be able
to restart the vehicle. Vehicle functions/driving
stability may be limited. Drive to an authorized
Audi dealer or authorized Audi Service Facility im-
mediately.
=} Electrical system: malfunction! Please con-
tact Service
Switch off all electrical equipment that is not
needed. Vehicle functions/driving stability may
be limited. Drive to an authorized Audi dealer or
authorized Audi Service Facility immediately.
= Electrical system: low battery charge. Bat-
tery
will be charged while driving
The starting ability may be impaired.
If this message turns off after a little while, the
vehicle battery has charged enough while driving.
If this message does not turn off, drive immedi-
ately to an authorized Audi dealer or authorized
Audi Service Facility.

ZA\ WARNING
When there is an electrical system malfunc-
tion, vehicle functions may not work and driv-
ing stability may be limited, which increases
the risk of an accident. Do not continue driv-
ing and switch the ignition off. See an author-
ized Audi dealer or authorized Audi Service Fa-
cility for assistance.

Battery
Pela lame ered)
Because of the complex power supply, all work on
batteries such as disconnecting, replacing, etc.,
should only be performed by an authorized Audi
dealer or authorized Audi Service Facility > A\. >

Wheels

Glossary of tire and loading
terminology
Accessory weight
means the combined weight (in
excess of those standard items
which may be replaced) of auto-
matic transmission, power steer-
ing, power brakes, power win-
dows, power seats, radio, and
heater, to the extent that these
items are available as factory-in-
stalled equipment (whether in-
stalled or not).
Aspect ratio
means the ratio of the height to
the width of the tire in percent.
Numbers of 55 or lower indicate a
low sidewall for improved steer-
ing response and better overall
handling on dry pavement.
Bead
means the part of the tire that is
made of steel wires, wrapped or
reinforced by ply cords and that is
shaped to fit the rim.
Bead separation
means a breakdown of the bond
between components in the bead.
292
Cord
means the strands forming the
plies in the tire.
Cold tire inflation pressure
means the tire pressure recom-
mended by the vehicle manufac-
turer for a tire of a designated
size that has not been driven for
more than a couple of miles (kilo-
meters) at low speeds in the three
hour period before the tire pres-
sure is measured or adjusted.
Curb weight
means the weight of a motor ve-
hicle with standard equipment in-
cluding the maximum capacity of
fuel, oil, and coolant, air condi-
tioning and additional weight of
optional equipment.
Extra load tire
means a tire designed to operate
at higher loads and at higher in-
flation pressures than the corre-
sponding standard tire. Extra load
tires may be identified as “XL”,
“xl”, “EXTRA LOAD”, or “RF” on
the sidewall.

Wheels

Production options weight
means the combined weight of
those installed regular production
options weighing over 5 lbs.
(2.3 kg) in excess of those stand-
ard items which they replace, not
previously considered in curb
weight or accessory weight, in-
cluding heavy duty brakes, ride
levelers, roof rack, heavy duty
battery, and special trim.
Radial ply tire
means a pneumatic tire in which
the ply cords that extend to the
beads are laid at substantially
90 degrees to the centerline of
the tread.
Recommended inflation
pressure
see > page 292, Cold tire infla-
tion pressure.
Reinforced tire
means a tire designed to operate
at higher loads and at higher in-
flation pressures than the corre-
sponding standard tire. Rein-
forced tires may be identified as
“XL”, “xl”, “EXTRA LOAD”, or “RF”
on the sidewall.
294
Rim
means a metal support for a tire
ora tire and tube assembly upon
which the tire beads are seated.
Rim diameter
means nominal diameter of the
bead seat. If you change your
wheel size, you will have to pur-
chase new tires to match the new
rim diameter.
Rim size designation
means rim diameter and width.
Rim width
means nominal distance between
rim flanges.
Sidewall
means that portion of a tire be-
tween the tread and bead.
Speed rating (letter code)
means the speed at which a tire is
designed to be driven for extend-
ed periods of time. The ratings
range from 93 mph (150 km/h)
to 186 mph (298 km/h) > table
on page 290. You may not find
this information on all tires be-
cause it is not required by law.
The speed rating letter code,
where applicable, is molded on
the tire sidewall and indicates the >