brake AUDI A6 2017 Service Manual

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.... N
" N .... 0 0 <..:l ' -Do not remove the engine cover under any
circumstances . This increases the risk of
burns.
- If tests need to be performed with the en­
gine running, there is additional danger due
to moving components (such as the ribbed belt, alternator and radiator fan) and from
the high voltage ignition system.
- Do not under any circumstances give gas in­
advertently (for example, by hand from the
engine compartment) if the vehicle is sta­
tionary but the engine is running and a gear
is engaged. Otherwise, the vehicle will start
to move immediately and this could result
in an accident.
- 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.
- To reduce the risk of electric shock and in­
jury, never touch the following components when the engine is running or is being start­
ed :
- Ignition cable
- Other components in the electronic high-
voltage ignition system
- If you must check or perform work on the
engine while it is running:
- Set the parking brake and place the selec­
tor lever in the P (park) position first .
- Always proceed with extreme caution so
that clothing, jewelry or long hair do not
become caught in the radiator fan, fan
belt or other moving components or do not come into contact with hot compo­
nents. Tie back long hair before beginning
work and do not wear clothing that can
hang down into the engine .
Checking and Filling
-Limit your exposure to exhaust and chemi­
cals to as short a time as possible
c:> A .
A 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
chemicals known to the State of California
to cause cancer and birth defects or other
reproductive harm.
- Battery posts, terminals and related acces­
sories contain lead and lead compounds,
chemicals known to the State of California
to cause cancer and reproductive harms. Wash hands after handling.
(D Note
When filling fluids, be sure not to mix the flu­
ids up. Otherwise severe malfunctions and en­
gine damage will occur.
@ For the sake of the environment
You should regularly check the ground under
your vehicle in order to detect leaks quickly. If
there are visible spots from oil or other fluids, bring your vehicle to an authorized Audi deal­
er or authorized Audi Service Facility to be
checked.
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Checking and Filling
_& WARNING
-The cooling system is under pressure. Do
not open the coolant expansion tank cap
when the engine is hot. This increases the
risk of burns.
- The coolant additive and the coolant can be
dangerous to your health. For this reason,
keep the coolant in the original container
and away from children. There is a risk of
poisoning .
- 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.
CD 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
Fig. 185 Engine compartment : ca p on brake fl uid re servoir
Observe the safety precautions c::> .&. in Working
in the engine comportment on page 198.
Checking the brake fluid level
• Read the brake fluid level on the brake fluid
reservoir
c::> page 201, fig . 182. The brake fluid
level must be between the MIN and MAX mark­
i n gs c::> .,&. .
The brake fluid level is monitored automatically .
206
Changing the brake fluid
Have the brake fluid changed regularly by an au­
thorized Audi dealer or authorized Audi Service Facility.
_& 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
authorized 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 would impair braking performance and driving safety, which increases the risk of an
accident .
- To ensure the brake system functions cor­
rectly, only use brake fluids that comply
with VW standard 50114 or FMVSS-116 DOT 4.
CD 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 get any brake fluid on the vehicle
paint, because it will corrode the paint.
Battery
General warnings about batteries
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
c:::, &.
The term "vehicle battery" refers to the 12 Volt
battery in your vehicle.
Detailed warnings for the vehicle battery:
®) Wear eye protection.
~ Battery acid is highly corrosive. Wear pro-
~ tect1ve gloves and eye protection. ..,.

Wheel s
® Mud and snow capability
"M/5" or "M+S" indicates the tire
is sui table for driving on mud and
snow.
& indicates a winter tire.
@ Composition of the tire cord
and materials
The number of plies indicates the
number of rubberized fabric lay­
ers in the t ire. In general: the
more layers, the more weight a
tire can carry . Tire manufacturers
must also specify the materials
used in the tire. These include
steel, nylon, po lyester and other
materials.
@ Maximum permitted load
This number indicates the maxi­
mum load in kilograms and
pounds that the tire can carry .
@Uniform tire quality grade
standards for treadwear,
traction and temperature resist ance
Tread wear, traction and temper ­
ature ranges¢
page 227.
@ Running direction
The arrows indicate the running
direction of unidirectional t ires .
You must always follow the speci­
fied running direction
¢page 241 .
212
@ Ma ximum permitted
inflation pressure
This number indicates the maxi­
mum pressure to which a tire can
be inflated under normal operat ­
ing condit ions.
Glossary of tire and loading
terminology
Acces sory we ight
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 r im . ...

Wheel s
Maximum (permissible)
inflation pressure
means the max imum cold infla­
tion pressure to which a t ire may
be inflated . Also called "maxi ­
mum inflation pressure."
Normal occupant weight
means 150 lbs. (68 k ilograms)
times the number of occupants seated in the vehicle up to the to­
tal seating capacity of your vehi­
cle .
Occupant distribution
means distribution of occupants
in a vehicle.
Outer d iameter
means the overall diamete r of an
inflated new tire.
Overall width
means the linear distance be­
tween the exteriors of the side ­
walls of an inflated tire , including
elevations due to labeling, deco­ rations, or protective bands or
ribs .
Ply
means a layer of rubber-coated
para llel cords.
2 14
Production options we ight
means the combined weight of
those installed regular product ion
options weighing over 5 lbs . (2 .3
kg) in excess of those standard
items which they replace, not pre­
viously considered in curb weight or accessory weight , including
heavy duty brakes, ride levelers,
roof rack, heavy duty battery, and
special trim.
Radial ply ti re
means a pneumatic tire in which
the ply cords that extend to the beads are la id at substantially 90
degrees to the centerline of the
tread.
Recommended inflation
pressure
see ¢ page 213 , 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. ...

Wheels
&,. WARNING -
-Only use tire/rim combina­
tions and suitable wheel bolts
that have been approved by
Audi. Otherwise, damage to
the vehicle and an accident could result.
-For technical reasons, it is not
possible to use tires from oth­
er vehicles -in some cases,
you cannot even use tires from
the same vehicle model.
-Make sure that the tires you
select have enough clearance
to the vehicle. Replacement
tires should not be chosen
simply based on the nominal
size, because tires with a dif­
ferent construction can differ
greatly even if they are the
same size. If there is not enough clearance, the tires or
the vehicle can be damaged and this can reduce driving
safety and increase the risk of
an accident.
-Only use tires that are more
than six years old when abso­
lutely necessary and drive
carefully when doing so.
-Do not use run-flat tires on
your vehicle. Using them when
218
not permitted can lead to ve­
hicle damage or accidents.
-If you install wheel covers on the vehicle, make sure they al­low enough air circulation to
cool the brake system. If they do not, this could increase the
risk of an accident.
Tire wear/damage
Fig. 189 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.
-Dr iving quickly through curves,
rapid acceleration and heavy
braking increase tire wear.
-Have an authorized Audi dealer
or authorized Audi Service Facili­
ty chec k the wheel alignment if
there is unusual wear.
-Have the wheels rebalanced if an imbalance is causing noticeable
i.

Wheels
A WARNING
Overloading a ve hicl e can cause
loss of vehicle control, a crash
or other accident, serious per­
sonal injury, and even death .
-Carrying more weight than your vehicle was designed to carry will prevent the vehicle
from handling properly and
i ncrease 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 -
i ncluding 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
limit
Use the example below to calcu­ late the total weight of the pas -
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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 t he statement "THE
COMBINED WE IGH T OF OCC U­
PANTS AND CARGO SHOULD
NEV ER EXCEED XXX KG OR XXX
LBS"on your vehicle's placard
(tire inflation pressure label)
¢ page 220, fig . 190 .
2. Determine the combined
weight of the driver and pas­
sengers that will be r iding in
your vehicle.
3. Subtract the combined weight
of the driver and passengers
from
"XXX" kilograms or "XXX"
pounds shown on the sticker
¢ page 220, fig. 190.
4. The resu lting fig ure equals the
available amount of cargo and luggage load capacity. For ex ­
ample, if the "XXX" amount
equals 1400 lbs . and there will
be five 150 lbs . passengers in
your vehic le, the amount of
available cargo and luggage load capacity is 650 lbs . .,.

Care and cleaning
-To reduce the risk of cuts, protect yourself
from sharp metal components when was h­
ing the underbody or the inside of the wheel
housings .
- After washing the vehicle, the braking effect
may be delayed due to mo isture on the
brake rotors or ice in the winter . This in­
creases the risk of an acc ident. The bra kes
must be d ried first w ith a few careful brake
applica tions.
0 Note
- If you wash the ve hicle in an automatic car
wash, you must fold the exterior m irrors in
to reduce the risk of damage. Power fo ld ing
ex ter ior mirro rs* m ust only be folded in and
out using the power folding function.
- To reduce the risk of paint damage, do not
wash the vehicle i n dire ct sunlig ht.
- T o reduce t he risk of damage to the surface,
do not use i nsec t remov ing sponges, ki tchen
s ponges or similar items. - Matte finish painted vehicle components:
-To reduce the r isk of damage to the sur-
face, do not use polis hing agents or hard
wax.
- Never use protective wax. It can destroy
the matte finish effect .
- Do not place any stickers or magnetic
signs on vehicle parts painted with matte
finish paint. The paint could be damaged
when the stickers or magnets are re­
moved. @ For the sake of the environment
Only wash t he ve hicle in facilities spec ially de­
signed for that pu rpose. This will reduce the
r isk of dirty wate r contaminated with o il from
ente ring the sewe r system.
Cleaning and care information
W hen clean ing and c aring for ind ividua l vehicle
com ponents, refer to the fo llow ing tables. The
info rmation conta ined there is simply recom­
mendations. Fo r quest ions or for components that are
not listed, cons ult an autho rized Audi
dealer or au thor ized A udi Service Fac il ity. Also
fo llow the information found in ¢ &. .
Ext erior cleaning
Component Situation Solution
Windshield wiper
Deposits ¢ page 48, Cleaning windshield wiper blades
blades
Headlights/
Deposits S
oft sponge with a m ild soap solutiona)
Tail light s
Sensors /
Deposits Sensors: soft cloth w ith solvent-free cleaning solut ion
camera lenses Camera lenses: soft cloth with alcohol-free cleaning solu-
tion
Snow/ice Hand br
ush/solvent-free de-icing spray
Wheels Road salt Water
Bra ke dust Acid-free special cleaning solution
E
xhau st tail pipes Road salt Water, clean ing solution su itab le for s tainless stee l, if nee-
essary
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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 on a level surface .
It you are on a steep hill, be especially careful.
.,. Set the parking brake .
.,. Switch the emergency flashers on .
... Set up the warning triangle
r=;, page 236 .
... Have the passengers exit the vehicle . They
should move to a safe place, for example be­
hind a guard rail.
A WARNING
Follow the steps given above. This is for your
protection and the for the safety of other driv­
ers.
Equipment
Warning triangle
A ppl ies to: ve hicles w ith warning triangle
Fig. 193 Luggage co mpartment lid : wa rnin g triangle
The warning triangle placed in the vehicle at the
factory is located in the luggage compartment.
... To remove the warning triangle, press the re-
tainer in the direction of the arrow
r=;, fig . 193
and fold the holder down.
The luggage compartment lid is only designed to
hold the warning triangle offered by the Audi
Genuine Accessories program.
236
Vehicle tool kit
Fig. 194 Luggage compartment: vehicle tool kit
The vehicle tools and vehicle jack* are stored in
the luggage compartment under the floor cover.
... Lift the cargo floor by the plastic handle.
.,. Hook the handle into the luggage compartment
weather strip.
.,. Turn the handle counter-clockwise and remove
the cover or the spare tire* .
.,. Unhook the cargo floor before closing the rear
lid .
A WARNING
Improper use of the vehicle jack can cause se­
rious personal injuries.
- Never use the screw driver hex head to
tighten wheel bolts, since the bolts cannot
attain the necessary tightening torque if yo u
use the hex head, potentially causing an ac­
cident.
- The factory-supplied jack is intended only
for your vehicle model. Under no circum­
stances should it be used to lift heavy
vehicles or other loads; you risk injuring
yourself.
- Never start the engine when the vehicle is
raised, which cou ld cause an accident .
- Support the vehicle securely with appropri­ ate stands if work is to be performed under­
neath the vehicle; otherwise, there is a po­
tential risk for injury .
- Never use the jack supplied with your Audi
on another vehicle, particularly on a heavier
one. The jack is only su itable for use on the
vehicle it came wi th.

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" N .... 0 0 <..:l ' @ Tips
The vehicle jack* in your vehicle is mainte­
nance-free.
Replacing wheels
Before changing a wheel
Observe the following precautions for your own
and your passenger's safety when changing a
wheel .
.,. After you experience a tire failure, pull the car
well away from moving traffic and try to reach
level ground before you stop¢,&. .
.,. All passengers should
leave the car and move
to a safe location (for instance, beh ind the
guardrail)¢ ,&..
.. Engage the
parking brake to prevent your vehi­
cle from rolling unintentionally ¢,&. .
.. Move
selector lever to position P ¢ ,&. .
.,. If you are towing a trailer, unhitch the trailer
from your vehicle.
.,. Take the
jack and the spare tire* out of the lug­
gage compartment c:> page 236.
A WARNING
You or your passengers could be inju red wh ile
changing a wheel if you do not follow these
safety precautions:
- If you have a flat tire, move a safe distance
off the road. Turn off the engine, turn the
emergency flashers on and use other warn ­
ing devices to alert other motorists .
- Make sure that passengers wait in a safe
place away from the vehicle and well away
from the road and traffic.
- T o help prevent the vehicle from moving
sudden ly and possibly slipping off the jack,
always fully set the parking brake and block
the wheel diagonally opposite the wheel be­ ing changed. When one front wheel is lifted
off the ground, plac ing the Automatic
Transmission in P (Park) will
not prevent the
vehicle from mov ing.
- Before you change a wheel, be sure the
ground is level and firm. If necessary, use a
sturdy board under the jack .
Emergency assistance
-Always store the vehicle too l kit, the jack
and the replaced tire in the luggage com­
partment
¢page 134.
@ Tips
Before changing the wheel, you must activate
the jacking mode, so that the automatic con ­
tro ls for the Adaptive Air Suspension* do not
make it more difficult to lift the vehicle with
the jack
c> page 239.
Changing a wheel
When you change a wheel, follow the sequence
described below step-by-step and in exactly that
order .
l. Activate the vehicle jack mode* ¢ page 239 .
2. Remove the decorative wheel cover* or the
wheel bolt caps* . For more details see also
¢ page 238, Decorative wheel covers or
¢ page 238, Wheels with wheel bolt caps .
3. Loosen the wheel bolts¢ page 238 .
4. Locate the proper mounting point for the
jack and align the jack below that point
¢page 239.
5. Raise the car with the jack c> page 239 .
6. Remove the wheel with the flat tire and then
install
the spare ¢ page 241.
7. Tighten all wheel bolts lightly.
8.
Lower the vehicle with the jack .
9 . Use the wheel bolt wrench and
firmly tighten
all wheel bolts
c> page 238.
10. Replace the decorative wheel cover* or the
wheel bolt caps*.
11. Deactivate the vehicle jack mode* in the
MMI:
I CARI function button > ( Car)* systems
control button > Servicing & checks > Air
susp.: jack mode > Off.
The vehicle jack mode* switches off automatica l­
ly at speeds above 6 mph (10 km/h).
A WARNING
--
Always read and follow all WARNINGS and in­
formation
¢ .&. in Raising the vehicle on
page 240
and c> page 242 .
237

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" N .... 0 0 <.,;) 'SI"
Taking the wheel off/installing the spare
Follow these instructions step-by-step for chang­
ing the wheel.
Fig. 201 Changing a wheel: us ing the screwdriver hahd le
(with the blade removed} to turn the bolts
F ig. 202 C hangin g a whee l: alignment pin ins ide the top
hole
After you have loosened all wheel bo lts and
raised the vehicle
off the ground, remove and re­
p lace the whee l as follows:
Removing th e wheel
.. Use the hexagon al so cket in the screwdri ver
handle
to completely remove the topmost
wheel bolt and set it aside on a
clean surface
¢ fig. 201 .
.. Screw the threaded end of the alignment pi n
from the tool kit hand-tight into the empty bolt
hole ¢
fig. 202 .
.. Then remove the other wheel bolts as described
above .
.. Take
off the wheel leaving the a lignment pin in
the bolt ho le ¢ 0 .
Puttin g on the spa re wh eel
.. Lift the spare wheel and carefully slide it over
the alignment pin to guide it in place ¢0 .
Em ergen cy a ssis tanc e
.. Use the hexagonal socket in the screwdr iver
handle to screw in and tighten all wheel bolts
slightly.
.. Remove the alignment pin and insert and tight­
en the remaining wheel bo lt slight ly like the
rest .
.. Tu rn the jack handle counter-clockw ise to lower
the vehicle unt il the jack is fully released .
.. Use the wheel bo lt wrench to t ighten a ll wheel
bol ts fi rmly¢
page 238. Tighten them cross­
wise,
from one bo lt to the (approx imately) op­
posite one, to keep the wheel centered.
(D Note
When removing o r insta lling the wheel, the
rim could h it the brake rotor and damage t he
rotor . Work carefully and have a second per­
son help you .
@ Tips
Never use the hexagonal socket in the hand le
of the screwdrive r to loosen or t ighten the
whee l bolts.
- Pull the reversible blade from the screwdriv ­
er before you use the hexagonal socket in
the handle to turn the whee l bolts.
- When mount ing tires with
unidirectional
tread de sign
make sure the tread pattern is
pointed the right way¢
page 241 .
-The wheel bolts should be clean and easy to
turn. Check for dirt and corrosion on the
mating surfaces of both the wheel and the
hub. Remove all dirt from these surfaces be­
fore remounting the wheel.
Tires with unidirectional tread design
Tires with unidirectional tread design must be
mounted with their tread pattern pointed in the
right direction .
Usi ng a sp are t ire w ith a tread patte rn
intended f or u se in a sp ecific direction
When using a spare tire with a tread pattern in­
tended for use in a specific direction, please note
the following:
- The direction of rotation is marked by an arrow
on the side of the tire. "'
241