brake AUDI A8 2020 Workshop Manual

Wheels


not permitted can lead to ve-
hicle damage or accidents.
—If you install wheel covers on
the vehicle, make sure they al-
low enough air circulation to
cool the brake system. If they
do not, this could increase the
risk of an accident.


Tire wear and damage
B4H-0415

a
Fig. 190 Tire profile: treadwear indica-
tor
Tire wear
Check the tires regularly for wear.
—Inflation pressure that is too low
or high can increase tire wear
considerably.
—Driving quickly through curves,
rapid acceleration, and heavy
braking increase tire wear.
—Have an authorized Audi dealer
or authorized Audi Service Facili-


) Obey any applicable regulations in the
country where the vehicle is being oper-
ated.
298
ty check the wheel alignment if
there is unusual wear.
—Have the wheels rebalanced if an
imbalance is causing noticeable
vibration in the steering wheel.
If you do not, the tires and other
vehicle components could wear
more quickly.
Treadwear indicator
Original equipment tires contain
treadwear indicators in the tread
pattern, which are bars that are
1/16 in (1.6 mm) high and are
spaced evenly around the tire per-
pendicular to the running direc-
tion > fig. 190. The letters “TWI”
or triangles on the tire sidewall
indicate the location of the tread-
wear indicators.
The tires have reached the mini-
mum tread depth !) when they
have worn down to the treadwear
indicators. Replace the tires with
new ones > A.
Tire rotation
Rotating the tires regularly is rec-
ommended to ensure the tires
wear evenly. To rotate the tires, >

4N0012721BD
Wheels


from handling properly and in-
crease the risk of the loss of
vehicle control.
—The brakes on a vehicle that
has been overloaded may not
be able to stop the vehicle
within a safe distance.
—Tires on a vehicle that has
been overloaded can fail sud-
denly, including a blowout and
sudden deflation, causing loss
of control and a crash.
—Always make sure that the to-
tal load being transported -
including the weight of a trail-
er hitch and the tongue
weight of a loaded trailer -
does not make the vehicle
heavier than the vehicle’s
Gross Vehicle Weight Rating.

Determining correct load
Talis
Use the example below to calcu-
late the total weight of the pas-
sengers and luggage or other
things that you plan to transport
so that you can make sure that
your vehicle will not be overload-
ed.
Steps for Determining Correct
Load Limit
1. Locate the statement “THE
COMBINED WEIGHT OF OCCU-
PANTS AND CARGO SHOULD
NEVER EXCEED XXX KG OR XXX
LBS” on your vehicle’s placard
(tire inflation pressure label)
> page 299, fig. 192.
2. Determine the combined
weight of the driver and pas-
sengers that will be riding in
your vehicle.
3. Subtract the combined weight
of the driver and passengers
from “XXX” kilograms or “XXX”
pounds shown on the sticker
=> page 299, fig. 192.
4. The resulting figure equals the
available amount of cargo and
uggage load capacity. For ex-
ample, if the “XXX” amount
equals 1400 lbs. and there will
be five 150 lbs. passengers in
your vehicle, the amount of
available cargo and luggage
oad capacity is 650 lbs.
(1400-750 (5 x 150) = 650
bs.)
5. Determine the combined
weight of luggage and cargo
being loaded on the vehicle.
That weight may not safely

303
>

Care and cleaning


height and width of the inside of the car
wash.
ZA WARNING
—To reduce the risk of accidents, only wash
the vehicle when the ignition is off and fol-
low the instructions from the car wash oper-
ator.
—To reduce the risk of cuts, protect yourself
from sharp metal components when wash-
ing the underbody or the inside of the wheel
housings.
— After washing the vehicle, the braking effect
may be delayed due to moisture on the
brake rotors or ice in the winter. This in-
creases the risk of an accident. The brakes
must be dried with a few careful brake appli-
cations.
—To reduce the risk of paint damage, do not
wash the vehicle in direct sunlight.
—To reduce the risk of damage, do not wash
decorative decals* with a pressure washer.
—To reduce the risk of damage to the surface,
do not use insect removing sponges, kitchen
sponges, or similar items.
— When washing matte finish painted vehicle
components:
— To reduce the risk of damage to the sur-
face, do not use polishing agents or hard
wax.
— Never use protective wax. It can destroy
the matte finish effect.
@) Note — Do not place any stickers or magnetic
signs on vehicle components painted with
matte finish paint. The paint could be
damaged when the stickers or magnets
are removed.

— If you wash the vehicle in an automatic car
wash, you must fold the exterior mirrors in
to reduce the risk of damage to the mirrors.
Power folding exterior mirrors* must only
be folded in and out using the power folding @) For the sake of the environment
function.
—To reduce the risk of damage to the rims
and tires, compare the width between the
wheels on your vehicle with the distance be-
tween the guide rails in the car wash.
—To reduce the risk of damage, compare the
height and width of your vehicle with the
Only wash the vehicle in facilities specially de-
signed for that purpose. This will reduce the
risk of dirty water contaminated with oil from
entering the sewer system.
Cleaning and care information
When cleaning and caring for individual vehicle are not listed, consult an authorized Audi dealer
components, refer to the following tables. The or authorized Audi Service Facility. Also follow
information contained there is simply recommen- __ the information found in > A.
dations. For questions or for components that
Exterior cleaning



Component Situation Solution
Windshield wiper | Deposits Soft cloth with glass cleaner > page 69
blades
Headlights/ Deposits Soft sponge with a mild soap solution®
Tail lights
Sensors/ Deposits Sensors: soft cloth with a solvent-free cleaning solution
camera lenses Camera lenses: soft cloth with an alcohol-free cleaning sol-
ution
Snow/ice Hand brush/solvent-free de-icing spray >

310

4N0012721BD
Care and cleaning




Component Situation Solution
Laser scanner Deposits Soft sponge with a mild soap solution®
Wheels Road salt Water
Brake dust Acid-free special cleaning solution
Exhaust tail Road salt Water, cleaning solution suitable for stainless steel, if nec-
pipes essary
Decorative parts/ | Deposits Mild soap solution ®, a cleaning solution suitable for stain-
trim less steel, if necessary

Paint Paint damage Repair with touch-up paint

Spilled fuel Rinse with water immediately

Surface rust Rust remover, then treat with hard wax; for questions, con-
sult an authorized Audi dealer or authorized Audi Service
Facility.

Corrosion Have it removed by an authorized Audi dealer or authorized
Audi Service Facility.

Water no longer
beads on the surface
of clean paint
Treat with hard wax (at least twice per year)

No shine even though
paint has been pro-
tected/paint looks
poor
Treat with suitable polish; then apply paint protectant if
the polish that was used does not contain any protectant

Deposits such as in-
sects, bird droppings,
tree sap, and road
salt
Dampen with water immediately and remove with a micro-
fiber cloth

Grease-based con-
taminants such as
cosmetics or sunblock
Remove immediately with a mild soap solution ® and a soft
cloth



Carbon compo-__| Deposits Clean the same way as painted components > page 309
nents
Decorative decals | Deposits Soft sponge with a mild soap solution®
Audi e-tron Deposits Soft, dry towel
charging system
Wall mount clip | Deposits Soft towel with alcohol-free cleaning solution

a) Mild soap solution: maximum two tablespoons of
Interior cleaning
neutral soap in 1 quart (1 liter) of water



Component Situation Solution
Window glass Deposits Glass cleaner, then wipe dry
Decorative parts/ | Deposits Mild soap solution®
trim

311

Emergency assistance

Emergency assistance
General information
> Park the vehicle as far as possible from moving
traffic in the event of a breakdown. In the event
of a flat tire, park the vehicle ona level surface.
If you are ona steep hill, be especially careful.
> Set the parking brake.
> Switch the emergency flashers on.
> Have the passengers exit the vehicle. They
should move to a safe place, for example be-
hind a guard rail.

WARNING
Follow the steps given above. This is for your
protection and the for the safety of others on
the road.

Equipment
Vehicle tool kit, tire mobility kit, and
Wuts BE la4
Applies to: vehicles with the vehicle tool kit, tire mobility kit,
and vehicle jack



Applies to:
Fig. 193 -Vehicles with conventional drive system- Lug-
gage compartment: cargo floor cover




Applies to:
Fig. 194 ---Vehicles with plug-in hybrid drive- Luggage
compartment: cover
316
Conventional drive system: The vehicle tool kit,
vehicle jack”, tire mobility kit*, and compressor*
are stored in the luggage compartment under
the cargo floor cover > fig. 193.
Plug-in hybrid drive: The vehicle tool kit, tire mo-
bility kit and the compressor are located on the
back side of the cover and in the compartment
underneath it > fig. 194.
Conventional drive system
> Lift the cargo floor by the plastic handle
> fig. 193.
> Hook the handle into the luggage compart-
ment weather strip.
> Applies to: vehicles with spare tire: Remove the
handle by turning it counter-clockwise and re-
move the spare tire.
> Unhook the cargo floor cover before closing the
luggage compartment lid.
Plug-in hybrid drive
> Open the cover using the handle > fig. 194.
Conventional drive system: Depending on the
equipment, the vehicle tool kit* may be located
under the spare tire*, under another cover, or in
the tool box.
@ Tips
— The vehicle jack* does not require any main-
tenance.
— Plug-in hybrid drive: The vehicle must not
be operated without the tire repair set.
Tire mobility kit
Applies to: vehicles with tire mobility kit
> Read and follow the important safety precau-
tions > page 316.
> Set the parking brake.
> Select the “P” position.
> Check if a repair with the tire mobility kit is pos-
sible > page 317.

4N0012721BD
Emergency assistance

Replacing wheels
You must complete the preparation before
changing a tire.
> Read and follow the important safety precau-
tions > page 316.
> Set the parking brake.
> Select the “P” position.
> When towing a trailer: disconnect the trailer
from your vehicle.
> Lay out the vehicle tool kit > page 316 and the
spare tire > page 322.
> Applies to: MMI: Select on the home screen:
VEHICLE > Settings & Service > Air suspen-
sion: wheel change.
> Switch the ignition off.

Z\ WARNING
The vehicle must also be secured to prevent it
from rolling when using the vehicle jack”. Use
suitable objects to block the front and back of
the wheel that is diagonal from the wheel
Removing the caps
with the flat tire.



B4L-1337

&




[
Fig. 198 Wheel: wheel bolts with caps
> Slide the plastic clip from the vehicle tool kit
onto the cap until it engages > fig. 198.
> Remove the cap with the plastic clip.

Anti-theft wheel bolts
Applies to: vehicles with anti-theft wheel bolts
i
> all
Fig. 199 Anti-theft wheel bolt with cap and adapter


B4H-0470
v

You need a special adapter in the vehicle tool kit
to remove the anti-theft wheel bolts.
>» Remove the cap @).
> Slide the adapter @) all the way onto the anti-
theft wheel bolt @.
» Slide the wheel wrench from the vehicle tool kit
all the way onto the adapter @).
> Loosen the wheel bolt > page 319.
@) Tips
Note the code number for the wheel bolt
adapter and store it in a safe place separate
from the vehicle. If you need a replacement
adapter, contact an authorized Audi dealer or
authorized Audi Service Facility and give them
the code number.
Loosening the wheel bolts

B4S-0221

Fig. 200 Wheel: loosening the wheel bolt
319

4N0012721BD
Emergency assistance

@) Note
Do not Lift the vehicle by the sill. Position the
vehicle jack only at the designated mounting
points on the side sill. Otherwise, your vehicle
could be damaged.
Removing and installing a wheel
@ g + “
0 oO

B8K-1477


Fig. 204 Wheel: alignment pin in the top hole
Removing a wheel
> Remove the top wheel bolt completely using
the hex socket in the screwdriver handle from
the vehicle tool kit > fig. 203 and place it ona
clean surface.
> Then install the alignment pin from the vehicle
tool kit by hand in the empty wheel bolt hole
> fig. 204”,
> Remove the rest of the wheel bolts.
> Remove the wheel >(). The alignment pin re-
mains in the hole while doing this.

D Applies to: vehicles with ceramic brake rotors*: Use a sec-
ond alignment pin* from the vehicle tool kit for the lowest
hole according to the steps described for the first align-
ment pin.
Installing a wheel
Read the directions on > page 321 when instal-
ling unidirectional tires.
> Slide the wheel on over the alignment pin >@.
> Install the wheel bolts and tighten them gently
using the hex socket.
> Remove the alignment pin and tighten the re-
maining wheel bolt.
> Carefully lower the vehicle using the vehicle
jack*.
> Tighten the wheel bolts in a diagonal pattern
using the wheel wrench.
The wheel bolts must be clean and loosen and
tighten easily. Check the contact surfaces for the
wheel and hub. Contaminants on these surfaces
must be removed before installing the wheel.

Z\ WARNING
— Read and follow the important information
and notes under > page 296.
— Never use the hex socket in the screwdriver
handle to tighten the wheel bolts. Using the
hex
socket will not achieve the required
tightening torque, which increases the risk
of an accident.
@) Note
When removing or installing the wheel, the
rim could hit the brake rotor and damage the
rotor. Work carefully and have a second per-
son help you.
Unidirectional tires
A unidirectional tire profile is identified by arrows
on the tire sidewall that point in the running di-
rection. You must always maintain the specified
running direction. This is necessary to ensure the
tire's optimal performance in regard to adhesion,
running noise, and friction, and to reduce the risk
of hydroplaning. >


321

Emergency assistance

4. Attach the other end of the negative cable
(black) to the jump-start pin @) on the vehi-
cle.
Starting the engine
> Start the engine in the vehicle giving the charge
and let it run at idle.
> Now start the engine in your vehicle, which has
the
drained battery.
> If the engine does not start, stop the starting
procedure after 10 seconds and then repeat it
after approximately 30 seconds.
> Turn on the rear window defogger in your vehi-
cle in order to reduce any voltage peaks that
may occur when disconnecting the jump start
cables. The headlights must be switched off.
> With the engines running, remove the cables in
reverse order of the way they were installed.
> Close the red cover on the positive terminal.

ZA WARNING
— Never connect the jump start cable directly
to your vehicle battery. Only use the connec-
tions in the engine compartment.
— Do not touch the non-insulated parts of the
terminal clamps. The cable must also not
come into contact with vehicle components
that conduct electricity when it is connected
to the positive vehicle battery terminal. This
can cause a short circuit.
— The plugs on the battery cells must not be
opened.
— Keep ignition sources (such as open flames,
burning cigarettes, etc.) away from the vehi-
cle batteries to reduce the risk of an explo-
sion.
— Route the jump start cables so they cannot
get caught in the moving parts in the other
vehicle's engine compartment.

@ Note
Please note that the connecting process previ-
ously described for the jump start cables is in-
tended for when your vehicle is being jump
started.
324
G) Tips
Make sure that the connected jump start ca-
bles have sufficient contact with metal.
Towing
General information
You should only perform the steps that follow if
you have the necessary tools and technical ex-
pertise.
Towing requires a certain amount of practice.
Audi recommends contacting a towing company
to have the vehicle transported.
You should only have your vehicle towed by an-
other vehicle when disabled in exceptional cir-
cumstances. Inexperienced drivers should not
tow.
Notes on towing
When the engine is stopped, the transmission
will not be sufficiently lubricated if traveling at
high speeds and long distances:
— The maximum permitted towing speed is 30
mph (50 km/h).
— The maximum permitted towing distance is 30
miles (50 km).
Additional information on towing with a tow
truck
The vehicle may only be towed with the front axle
raised. Do not wrap any chains or cables around
the brake lines.
Tow bar and towing cable
The vehicle can be towed with a tow bar or tow-
ing cable. Both drivers should be familiar with
the
special considerations when towing, especial-
ly when using a towing cable.
Always make sure the traction force does not ex-
ceed the permitted level and there are no shock
loading conditions. There is always the risk of the
coupling becoming overloaded when driving off-
road.
For the most safety and security, drive with a tow
bar. You should use a towing cable only ifatow >

4N0012721BD
Emergency assistance

bar is not available. Use a towing cable made of
synthetic elastic cable similar elastic material.

Z\ WARNING
— Towing highly increases the risk of an acci-
dent, for example from colliding with the
towing vehicle.
— To reduce the risk of an accident, do not al-
low anyone to remain inside the vehicle
when it is being transported by a tow truck
or a special transporter.
@) Note
— If normal towing is not possible, for exam-
ple if the transmission is faulty or if the
towing distance is greater than 30 miles
(50 km), then transport the vehicle on a
special carrier.
— If the vehicle is towed by a tow truck at the
axle that is not permitted, this can cause se-
vere damage to the transmission.

— The vehicle must not be tow started for
technical reasons.
@ Tips
— If the power supply is interrupted, then it
will not be possible to move the selector
lever out of the "P" position. The parking
lock must be released using the emergency
release before towing the vehicle
=> page 116.
— Switch Audi pre sense* off > page 185 when
loading the vehicle onto a vehicle carrier,
train, ship, or other type of transportation,
or when towing the vehicle. This can prevent
an undesired intervention from the pre
sense* system.
— Follow the local legal regulations for tow-
ing.
Read and follow the important information under
=> page 324.
Preparations
> Only secure the towing cable or tow bar at the
designated towing loops > page 325,
=> page 326.
> Make sure the towing cable is not twisted. Oth-
erwise it could disconnect from the towing loop
while towing.
> Switch the emergency flashers on in both
vehicles > page 64. However, do not do this if it
prohibited by law.
Towing vehicle (front)
> Only start to drive when the towing cable is
taut.
> Press the brake pedal very carefully.
> Avoid sudden braking or driving maneuvers.
Vehicle being towed (rear)
> Make sure the ignition is switched on so that
the steering wheel is not locked and so that you
can use the turn signals, the horn, and the
windshield wipers if needed > A\.
> Switching it off before the vehicle has stopped
may impair the function of the brake booster
and power steering. You would then need to
use more force to steer and brake the vehicle.
> Release the parking brake > page 124.
> Select the “N” selector lever position.
> Make sure the towing cable is always taut.

ZA WARNING
Never tow a vehicle using a tow bar or towing
cable if the vehicle does not have electrical
power.

Front towing loop
BFV-0305


Fig. 207 Front bumper: installing the towing loop
325

4N0012721BD
Fuses and bulbs


Windshield washer system/headlight
washer system

Right headlight electronics

Front seat heating

Right rear door control module

Sockets

Left front door control module

Parking heater



. | Equipment

Anti-theft alarm system

Engine control module

Horn

Parking brake

Gateway control module (diagnosis)

Interior headliner lights

Driver assist systems control module

Airbag control module

Electronic Stabilization Control (ESC), An-
ti-Lock Braking System (ABS)

12
Rear climate control unit, diagnostic con-
nector,
light/rain sensor

13) Climate control system

14 Right front door control module

15 Climate control system, body electronics

16 Brake system



13 | Radiator fan

14 | Engine control module

15 | Engine sensors


16 | Fuel pump

Fuse assignment - luggage compartment



Fig. 213 Luggage compartment: fuse panel with plastic
bracket


No. Equipment





Fus 1 |Thermal management
No. | Equipment 5 |Air suspension
2 |Engine components 6 |Automatic transmission
3 | Engine components 7 |Right rear seat adjustment
4 | Engine components 8 |Rear seat heating
5 | Brake light sensor 9 |Central locking, left tail light
6 |Engine components 10 | Front belt tensioner on driver's side
7 |Engine components 11 | Central locking, rear blind, fuel filler door
8 | Engine components 12 |Luggage compartment lid
9 | Engine components
10 | Oil pressure sensor, oil temperature sensor

bh BR Engine start

Bb N

Engine components


No. | Equipment

1 | Rear climate control system blower >

329