brake AUDI S4 2014 Workshop Manual

-To reduce the r isk of being burned, never
open the hood if you see or hear steam
or coolant escaping from the engine
compartment . Wait until no steam or
coolant can be seen or heard before ca re­
fully opening the hood .
- Keep children away from the engine com ­
partment.
- Never spill flu ids on hot engine compo­
nents. They can cause a fire .
- Never touch the radiator fan. The aux ili­
ary e lectr ic fan is temperature controlled
and can switch on suddenly .
- Never open the coolant reservoir cap
when the eng ine is still warm . The cool­
ant system is pressur ized and hot coo l­
ant could spray out.
- Protect your face, hands and arm from
steam or hot eng ine coolant by placing a
thic k rag over the cap when you open the
coolant reservoir.
- Do not remove the engine cover under
any c ircumstances. Th is increases the
risk of bu rns.
- If wo rk on the fuel system or the electri­
cal sys tem is ne cessary:
- Always disconnect the battery.
- Never smoke or work near heaters or
open flames . Fluids in the engine com­
partment co uld start a fire.
- Keep an approved fire extinguisher im­
mediately ava ilable.
- To avoid electrical s hock and persona l in­
jury while the engine is running or being
started, never touch:
- Ignition cables
- Other components of the high voltage
electronic ignition system.
- If you must perform a check or repa ir
with the engine running:
- Fir st, fully apply the parking brake,
move se lector lever of a utomatic trans-
Checkin g and fillin g 215
mission to "P" (Park); put manual
transmission in Neutral.
- Always use extreme caution to prevent
clothing, jewe lry, or long hair from get­
ting caught in the radiator fan, V-be lts
or other moving parts, or from contact­ i ng hot parts . Tie back hair before
starting, and do not wear clothing that
will hang o r droop into the engine .
- Minimize exposure to emission and
chemical hazards~&. .
A WARNING
California Proposition 65 Warning:
- Engine exhaust, some of its const ituents,
a nd certain vehicle components contain
or emit chemicals known to the State of
Ca lifornia to cause cance r and birth de­
fects and reproductive harm. In addition, certain fl uids contained in veh icles and
certain products of component wear con­
tain or emit chemica ls known to the
State of California to cause cancer and
birth defects or other reproductive harm.
- Battery posts, terminals and related ac­
cessories conta in lead and lead com­
pounds, chemicals known to the State of
California to cause cancer and reproduc­
tive harms. Wash hands afte r handling.
Q) Note
When adding f lu ids, always make sure that
they are poured into the proper conta iner
or f iller opening, otherwise serious dam­
age to vehicle systems w ill occur .
@ For the sake of the environment
To detect leaks in time, inspect the vehicle
floor pan from underneath regular ly . If
you see spots from oil or other veh icle flu­
i ds, have your vehicle inspected by an au­
thorized Audi dealer. •
•

224 Checking and filling
Brake fluid
Checking brake fluid level
The brake fluid level can be checked with a
quick glance .
N N ~ N
" (X) (0
Fig. 186 Engine compart ment: Cover on the brake flu·
id reservo ir
Before you check anything in the engine com­
partment,
always read and heed all WARN·
INGS ¢.&._ in Working in the engine compart­
ment on page 214 .
.. Read the brake fluid level from the brake
fluid reservoir ¢
fig. 186, ¢ page 216,
fig . 182.
The brake fluid level must be be ­
tween the "MIN" and
"MAX" markings.
The brake fluid reservoir is located at the rear
partition of the engine compartment on the
left side
¢ page 216.
The fluid level may drop slightly after some
time due to the automatic adjustment of the
brake pads . This is not cause for alarm.
If the brake fluid level falls
considerably be­
low the "MIN" mark, the brake warning/indi­
cator light (U.S. models: ., Canadian mod­
els: .) will come on¢
page 15. Do not con­
tinue to operate the vehicle . The complete
brake system should be thoroughly checked
by an authorized Audi dealer or qualified
workshop and the cause corrected .
If the
brake fluid level is too low, the brake warning/
indicator light will illuminate. Contact an au­
thorized Audi dealer
immediately .
@ Tips
The brake fluid reservoir is located under­
neath the cover.
Changing brake fluid
Have the brake fluid changed by an experi­
enced technician .
Brake fluid absorbs moisture from the air. If
t he water content in the brake fluid is too
high, corrosion in the brake system may result
after a period of time . The boiling point of the
brake flu id will also decrease conside rably and
decrease braking pe rformance.
Therefore, the brake fluid must be changed
every two years . Always use new brake flu id
which conforms to Federal Motor Vehicle
Standard "FMVSS 116 DOT 4".
The brake fluid reservoir can be difficult to reach, therefore, we recommend that you
have the brake fluid changed by your author­
ized
Audi dealer. Your dealer has the correct
tools, the right brake fluid and the know-how
to do this for you .
A WARNING
- Brake fluid is poisonous . It must be stor­
ed only in the closed original container
out of the reach of children!
- Brake failure can resu lt from o ld or inap­
propriate brake fluid. Observe these pre­
cautions:
- Use only brake fluid that meets SA E
specification
J 1703 and conforms to
Federal Motor Vehicle Standard 116.
Always check with your authorized Audi
dealer to make sure you are using the
correct brake fluid. The correct type of
brake f luid is also indicated on the
brake fluid reservoir.
- The brake fluid must be new. Heavy use
of the brakes can cause a vapor lock if
the brake fluid is left in the system too
long . This can seriously affect the effi­
c iency of the brakes as well as your
safety. This could resu lt in an accident.
(D Note
Brake fluid will damage the paint of your
vehicle .

@ For the sake of the environment
Because of the pr oblem of proper d isposa l
of brake flu id as we ll as the special tools
requ ired and the necessary expert ise, we
recommend that you have the brake fluid
changed by your author ized Audi dealer .
Battery
General information
Under normal operating conditions, the bat­
tery in your Audi does not need any mainte ­
nance. With
high outside temperatures or
long daily dr ives we recommend that you have
the electro lyte level checked by an authorized
Aud i dealer or qualified workshop . The elec­
trolyte leve l should also be checked each time
the battery is charged ¢
page 22 7.
H ave the battery checked when you take your
ve hicle in for service . Yo u are well adv ised to
replace a battery that is older than 5 yea rs .
W ith certa in types of a irbag deployment, t he
b attery is d isconnected from the vehicle elec­
tr ica l system for safety reasons¢.&.
in Re ­
pair, care and disposal of the airbags on
page 159.
Disconnecting the battery terminals
Some vehicle functions (power w indow regu­
lators , for example) are lost if the battery ter­
m inals a re d isconnected. These func tions have
to be re lea rned after the batte ry term inals a re
connected agai n. T o prevent this , the bat tery
should only be d isconnec ted from the vehicle
e lec tric al system when absolu tely necessa ry
for repairs .
Vehicles not driven for long periods
If you do not drive you r vehicle over a period
of severa l days or weeks, elec trical compo­
nen ts are gr adually cut b ack o r swi tched off .
This redu ces energy cons umption and main­
tains starting capab ility over a longer per io d
¢ page 193.
Some o f the conven ience f unctions m ay not
ope rate, su ch as the in ter ior lig hts or t he
Checkin g and fillin g 225
power seat adjus tment. The convenience
funct io ns w ill be available again when yo u
turn o n the ign ition and start the engine.
Winter operation
D ur ing the w inte r mon ths, bat tery capa city
tends to dec rease as tempera tures drop . This
is beca use more power is a lso consumed wh ile
starting, and the headlights, rear window de­
fogge r, etc., are used more often.
Avoid unnecessary powe r consumpt ion, pa r­
ticular ly in city traffic or when traveling only
sho rt distances. Let yo ur authorized A udi
dealer check the capacity of the vehicle bat ­
tery before w inter sets in
¢ page 227. A well
charged battery will no t on ly prevent star tin g
problems w hen the weather is cold, but w ill
also last longer .
@ Tips
If your vehicle is left standing for seve ral
weeks at extremely low temperatures, the
vehicle battery s hou ld be removed and
stored where it will not freeze . This will
p revent it from be ing damaged and having
to be repla ced .
Working on the battery
Be especially careful when working on or near
the bat tery.
The battery is located in the luggage compar t­
ment under the floor . B efo re you che ck any­
thi ng in the luggage compartment,
read and
heed all WARNINGS
¢ ,&. .
Always heed the safety warnings , when work­
i ng on the veh icle batte ry or t he vehicle e lec­
t rical sys tem to p reven t inju ry.
The following WARNINGS are very
important when working on the battery:
Always heed the following WARNING SYM· BO LS and safety precautions when working
on the battery .
®
Always wear eye protection.
•
•

-Never mount used tires on yo ur vehicle if
yo u are not sure of their "previous histo­
ry." Old used tires may have been dam­
aged even though the damage cannot be
seen that can lead to sudden tire failure
and loss of vehicle control.
- If you notice unusual vibration or if the
vehicle pulls to one side when d riving, al­
ways stop as soon as it is safe to do so
and check the wheels and tires for dam­
age .
(D Note
-Please note that summer and winter
tires are designed for the cond itions that
are typ ic al in those seasons. Aud i recom­
mends using w inter t ires du ring the win-
Glossary of tire and loading terminology
Accessory weight
means the comb ined weight (in excess of
those standard items which may be replaced)
of automatic tra nsmission, power steering,
power brakes, power windows, power seats,
radio, and heater, to the extent that these
items are availab le as factory-installed equip­
ment (whether installed or not) .
Aspect ratio
means the ratio of the height to the width of
the tire in percent . Numbers of 55 or lower in­
d icate a low sidewall for improved steering re­
sponse and better overall handling on dry
pavement .
Bead
means the pa rt of the ti re that is made of
steel wires, wrapped or reinforced by ply cords
and that is shaped to fit the rim.
Bead s eparation
means a b reakdown of the bond between
components in the bead.
Cord
means the strands forming the plies in the
tire.
Tire s an d wheel s 231
ter months . Low temperatu res signifi­
cantly decrease the elastic ity of summer
t ires, which affects traction and braking
ability. If summer tires are used in very
co ld temperatures, cracks can form on
the tread bars, res ulting in permanent
ti re damage that can cause loud drivi ng
noise and unbalanced tires. Aud i is not
responsib le for this type of damage.
- Burn ished, polished or chromed rims
must not be used in winter weather. Th e
surfa ce of the rims does not have suffi­
c ien t cor rosion pro te cti on for this and
c o ul d be pe rmanen tly damaged by road
salt or similar substances. This damage
is not covered by warranty.
Cold tir e inflation pressure
me ans the t ire press ure re commended by the
vehicle manufacturer fo r a tire o f a des igna ted
size that has not bee n driven for more than a
couple of miles (k ilomete rs) at low speeds in
the three hour pe riod before the tire press ure
is measured or adjusted.
Curb weight
means the weight o f a motor vehicle with
standard equipment including the maximum
capacity of fuel, o il, and coolant, air cond i­
tion ing and additional weight of optiona l
equipment.
E xtra load tire
means a tire design to operate at higher loads
and at higher inflation pressures than the cor­
responding standard tire. Extra load tires may
be identified as "XL", "xl", "EXTRA LOAD", or
"RF" on the sidewall.
Gross Axle Weight Rating ("GAWR")
means the load-carrying capacity of a single
axle system, measured at the tire-ground in-
ter~ces .
~
•
•

232 Tires and wheels
Gross Vehicle Weight Rating ("GVWR" )
means the maximum total loaded weight o f
the vehicle.
Groove
means the space between two adjacent tread
ribs.
Load rating (code)
means the maximum load that a tire is rated
to carry for a given inflat ion pressure. You
may not find this informat ion on all tires be­
cause it is not requ ired by law .
Ma ximum load rating
means the load rating for a t ire at the maxi­
mum permissible inflation pressure for that
tire .
Maximum loaded vehicle weight
means the sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity we ight, and
(d) Production opt ions weight
Maximum (permissible) inflation pressure
means the maximum cold inflation pressure
to which a tire may be inflated . Also called
"maximum inflation pressure."
Normal occupant weight
means 150 lbs. (68 kilog rams) times the
number of occupants seated in the vehicle up
to the tota l seating capacity of your vehicle.
Occupant distribution
means dist ribution of occupants in a veh icle.
Outer diameter
means the overall diameter of an inflated new
tire.
Overall width
means the linear distance between the exteri ­
ors of the sidewalls of an inflated tire, includ­
ing elevations due to labeling, decorations, or
protective bands or ribs .
Ply
means a layer of rubbe r-coated parallel cords.
Production options weight
means the combined weight of those installed
regular production opt ions we ighing over 5
lbs. ( 2.3 kg) in excess of those standa rd items
wh ich they replace, not previously cons idered
in curb weight or accessory weight, including
heavy duty brakes, ride levelers, roof rack,
heavy duty battery, and special tr im.
Radial ply tire
means a pneumat ic tire in which the ply cords
that extend to the beads are laid at substan­
tially 90 deg rees to the center line of the
tread.
Recommended inflation pressure
see c:::> page 231, Cold tire inflation pressure .
Reinforced tire
means a tire design to operate at higher loads
and at higher inflation pressures than the cor­
responding standard tire. Reinforced tires
may be identified as "XL", "xl", "EXTRA LOAD",
or "RF" on the sidewall.
Rim
means a metal support for a tire or a t ire and
tube assembly upon which the tire beads are
seated .
Rim diameter
means nominal diameter of the bead seat. If
you change your wheel s ize, you w ill have to
purchase new tires to match the new rim di­
ameter .
Rim size designation
means rim diameter and width.
Rim width
means nom inal distance between rim flanges.
Sidewall
means that portion of a tire between the
tread and bead .

236 Tires and wheels
Model Tire designation Tire pressure
Engine normal load condition full load condition
(up to 3 occupants)
front rear front rear
PSI kPA PSI kPA PSI kPA PSI kPA
S4 Sedan : 245/40 Rl8 93H
36 250 32 220 41
280 41
280 3.0 liter All Sea son
6-cylinder 245/40 Rl8 93V
High Performance
39 270 3 5 24 0 41 28 0 41 280
255/35 Rl9 96V XL
39 270
33 230 41
280 41 280 High Perfo rmance
XL= reinforced or extra load tire. It may al so appear a s xl , EXTRA LOAD, or RF on the tire side-
wall.
The correct tire pressure for the spare wheel i s
l o cated on a label on the dr ive r's side B-p illa r.
Because tec hnical cha nges may be made to
ve hicle equ ipment dur ing the model yea r, a l­
ways compa re the tire size designation on the
tire pressure labe l o n you r ve hicl e w it h the
tires on your vehicle. M ake s ure that the t ire
size info rmation on the veh icle label is the
same as the size of the t ire s on the vehicle.
This is especially important if the vehicle be ­
l ongs to someone else or you bought the veh i­
cle with different rims/tires or you boug ht the
ve hicle as a p reviously owned vehicle.
Remembe r, your safety and that of your pas ­
sengers also depends on mak ing s ure that
load limits are not exceeded. Vehicle load in­
cludes everybody and everything in and on the
ve hicle . These load lim its are technically refer­
red to as th e vehicle's G ross Vehicle We ight
Rati ng ("GVWR"). The G ross Ax le Weight Rat­
i ng ("GA WR") is the ma ximum load tha t can
be applied at each o f the veh icle's two axles.
T he G ross Vehicle We ig ht Rating and the
Gross Axle Weight Rating a re listed on the
safety compliance st ic k er labe l located on the
driver's side B-p illar. The tire pressure label on
your Aud i lists the maximum combined
weight of all of the occupants and luggage or
o ther cargo tha t the vehicl e can carry. For the
l ocat io n of the ti re pressu re labe l~
fig . 189 .
A WARNING
Overloadin g a vehicle can cause loss of ve­
hi cle cont ro l, a c rash or other accident, se­
rious pe rsonal injury, and even death.
- Ca rrying more we ight tha n your ve hicle
was des igned to carry will prevent the
veh icle from handling properly and in­
crease the risk of a loss of vehicle con ­
trol.
- The brakes on a vehicle that has been
overloaded may not be able to stop the
ve hicle w ith in a safe distanc e.
- Tires on a vehicle that has been overload­
ed can fail s uddenly ca us ing loss of con­
trol and a crash.
- Always make sure that the total load be­
i n g transported -including t he weight of
a trailer hitch and t he tongue we igh t of a
loaded tr ail er -does not ma ke t he ve hi­
cle he avier th an the vehicle' s Gro ss V ehi­
cle Weigh t Ra tin g.
.8_ WARNING
- In co rrec t tire pressure s and /or u nderin­
fl ation can lead to a serio us or fatal acci ­
dent .
- I nco rrec t tire pressures an d/or un derin­
fla tion ca use increased ti re wear an d can
affect the handling of the vehicle. .,.

not exceeded . Vehicle load includes everybody
and everything in and on the vehicle. These
l oad limits are techn ica lly referred to as the
ve hicle's
Gross Veh icle We ight Rat ing
("GVWR").
The "GVWR" includes the weight of the basic
veh icle, all factory insta lled accessories, a full
tank of fu el, oil, coolant and other fluids plus
maximum load. The maximum load includes
the number of passengers that the vehicle is
i n tended to carry ("seating capacity") with a n
assumed weight of 150 lbs . (68 kg) for each
passenger at a des igna ted sea ting pos ition
and the tota l we ight of any l uggage in the ve­
h icle. If you tow a trailer, the weight o f the
trailer hitch and the tong ue weight of the
l oaded trailer must be included as part of the
veh icle load.
The
Gro ss A xle Weight Rating ("GAWR") is
the maximum load that can be applied at each
of the vehicle's two ax les.
The G ross Vehicle We ight Rating and the
Gross Axle Weight Rating are listed on the
safety compliance sticker labe l located on the
driver's side B -pi llar . Your Audi has 5 seating
positions, 2 in the front and 3 in the rear for
tota l seating capacity of 5. Each seating posi­
tion has a seat belt¢
page 138, Safety belts.
The fact that there is an upper limit to your
veh icle's Gross Vehicle Weight Rating means
that the tota l weight of whatever is being car­
ried in the vehicle (including the weight of a
trailer hitch and the tongue weight of the
loaded trailer) is limited. The more passen­
ge rs in the veh icle or passengers who are
h eav ier than the standa rd weights assumed
mean that less weight can be ca rr ied as l ug­
gage.
The tire pressure labe l on you r Audi also lists
the maximum combined we ight of all of the
oc cu pants and luggage o r othe r ca rgo that
the vehicle can carry . For the location o f the
l abe l
¢page 234, fig. 189.
Tires an d wheel s 239
A WARNING
Overloading a vehicle can cause loss of ve­
h icle contro l, a crash or other accident, se­
rious pe rsonal injury, and even death.
- Carrying more we ight than your veh icle
was des igned to carry will prevent the
veh icle from handling properly and in­
crease the risk of the loss of vehicle con­
trol.
- The brakes on a vehicle that has been
overloaded may not be able to stop the
veh icle w ith in a safe distance.
- Tires on a vehicle that has been overload­
ed can fail suddenly, incl uding a blowout
and sudden defla tion, causing loss of
contro l and a crash.
- Always ma ke sure that the total load be­
ing transpor ted - incl uding the weight of
a trailer hitch and the tongue weight of a loaded trailer -does not ma ke the vehi­
cle heavier than the vehicle's Gross Vehi­
cle We ight Rating.
Determining correct load limit
U se th e example below to ca l­
culate the total weight of the
pa ssengers and lu ggage or oth­
e r thing s that you pl an t o tran s­
po rt so that you can make sur e
that your vehicle will not be
o verloaded.
Steps for Determining
Correct Load Limit
1 . Lo cate th e statement "THE
COMBINED WEIGHT OF O C­
CUPANTS AND CARGO
SHOULD NE VER E XCE ED XXX
KG OR XXX LBS"on your vehi-
c le 's pla card (tire inflation ..,
•
•

symbols) indicate the positions of the tread
wear indicators. Worn tires must be replaced.
Different fig ures may apply in other co untries
c:> .&. .
Tir e pres sure
Incorrect tire pressure causes premature wear
and can cause sudden tire blow -out. For this
reason, tire pressure must be checked at least
once a month
<=:> page 237.
Driving sty le
Driving fast around curves , heavy acceleration
and hard braking increase tire wear .
Rotating tires for mo re even wear
For all four t ires on your vehicle to have the
same se rvice life, we recommend that the
fro nt and rea r tires are rotated according to
the t ire manufacture r's suggested tire rota­
tion intervals. Please remember the follow ­
ing:
- T ire rotat ion inte rva ls may differ from the
vehicle service intervals outlined in your
Maintenance and Wa rranty Booklet .
- T he longer one tire is used in one location
on the vehicle, the more it wears at certa in
points; therefore, we recommend that you
fo llow the t ire manufacturer's suggested
t ire rotation intervals .
- Vehicles with front -wheel drive experience
more tread wear on the front wheels com­
pared to all whee l drive (quattro).
- Please rotate tires as shown
<=:> fig. 192.
-Extra care must be taken when rotating di-
rection-specific tires
c:> page 259 .
Wheel balancing
The wheels on new vehicles are balanced .
H oweve r, va rio us situations d uring eve ryday
driving can cause them to be come unbal­
anced, resu lting in vibrations you can us ually
feel through the steering wheel.
Unba lanced whee ls must be rebalanced to
avoid excessive wea r on s teer ing , suspens ion
and tires. A wheel must a lso be rebalanced
when a new tire is installed.
Tire s an d wheel s 241
Incorrect wh eel alignment
Incor rect wheel alignment can cause exces­
sive tire wear, impairing the sa fety of the vehi ­
cle . If tires show excessive wear, have the
whee l alignment checked by an authorized
Audi dealer or qualified workshop.
All wheel drive
Vehicles wi th quattro must always have tires
of the same size, construction and tread type.
For details see
<=:> page 192.
_8 WARNING
Sudden tire fa ilure can lead to loss o f con­
trol, a crash and serio us personal in jury!
- Never drive a vehicle when the tread on
any tire is worn down to the wear indica­
tors.
- Worn ti res are a safety hazard, they do
not grip well on wet roads and increase
your r isk of "hydroplaning" and loss of
control.
- Always keep chemicals that can cause
tire damage, such as grease, o il, gasoline
and brake fluid away from tires.
- Tires age even if they are not being used
and can fail sudden ly, especially at high
speeds. T ires that are more than 6 years
old can only be used in an emergency
and then w ith special care and at lower
speeds.
- Never mount used tires on your veh icle if
you are not sure of thei r "previo us histo­
ry ." O ld used tires may have been dam­
aged even thoug h the damage cannot be
seen that can lead to sudden tire fai lure
and loss of vehicle control. •
•

24 4 T ire s and wheel s
Tire pl y compo sit ion and materi als used
The numbe r of plies ind icates the n umber of
l ayers of rubber -coated fabric in the tire. In
general, the greater the number of p lies, the
more weight a tire can support . Tire manufac­
turers also must indicate the materials in the
tire, wh ic h include steel, nylon, polyester, and
others.
M ax imum Load R ating
This number indicates the maximum load in
kilograms and pounds that can be carried by
the tire .
Tire quality grading for treadw ear ,
tr act ion, a nd t emper ature re sis tan ce
Tread wear, traction and temperature grades
c:> page245.
Max imum Permiss ibl e Inflation Pressur e
This numbe r is the greates t amo unt of air
p ress ure that sho uld ever be put in the ti re
under normal driving conditions .
A WARNING
-Us ing incorrect or unmatched tires and/
or wheels or improper tire and wheel
combinations can lead to loss of contro l,
co llision and serious persona l injury .
- Always use tires, rims and wheel bo lts
that meet the specifications of orig inal
factory-installed t ires or other combina­
t ions that have been spec ifically ap­
proved by the vehicle manufacturer.
- Tires age even if they are not be ing used
and can fail suddenly, especially at high
speeds. Tir es that are more than 6 years
o ld can only be used in an emergency
and then with special care and at lower
speeds.
- Never mount used ti res on yo ur vehicle if
yo u are not su re of their "previous histo ­
ry ." Old used tires may have been dam­
aged even though the damage cannot be
seen that can lead to sudden tire failure and loss of vehicle control.
- All four wheels must be fitted with radia l
t ires of the same type, size (roll ing c ir- cumference) and the same tread pattern
.
Driving with different tires reduces vehi­
cle handling and can lead to a loss of
control.
- If the spare tire is not the same as the
tires that are mounted on the vehicle -
for example with winter tires - only use
the spare t ire fo r a short pe riod of time
and d rive with extra care . Refit the nor­
mal road wheel as soon as safely poss i­
b le.
- Never d rive faster than the max imum
speed for which the tires on you r vehicle
are rated because tires that are dr iven
faster than their rated speed can fai l
suddenly .
- Overloading tires cause heat build-up,
sudden tire fa ilure, including a blowout
and sudden deflation and loss of cont ro l.
- Temperature grades apply to tires that are properly inflated and not over or un­
de rinf lated .
- For technica l reasons it is not always
possible to use whee ls from other
veh icles -in some cases not even wheels
from the same veh icle model.
- If you install wheel trim discs on the ve­
hicle wheels, make sure that the a ir flow
to the brakes is not blocked. Reduced air­
f low to the brakes can them to overheat,
increas ing stopp ing distances and caus­
ing a co llision.
- Run flat tires may only be used on veh icles that were equipped with them
at the factory. The veh icle must have a
chassis designed for run flat tires and a
f a ctory -inst alled tire pressure monitor­
ing sys tem * that indicates a loss of tire
pressu re . I ncorrect use of run flat tires
can lead to vehicle damage or accidents.
Check with an authorized Audi dealer or
tire specialist to see if your vehicle can be
equ ipped w ith run flat t ires. If run flat
tires are used, they must be installed on
all fo ur wheels . Mix ing tire types is not
pe rm itted.

Snow chains
Snow chains may be fitted only to the front
wheels, and only to certain tire sizes. Ask your
authorized Audi dealer on which tire sizes
snow chains can be used.
The snow chains must have low-profile links
and must not be thicker than 0.53 inch
(13.5 mm), including the lock .
Remove wheel center covers and trim discs
before putting snow chains on your vehicle
~ 0. For safety reasons cover caps must then
be fitted over the wheel bolts. These are avail­
able from authorized Audi dealers.
~ WARNING
Using the wrong snow chains for your vehi­
cle or installing them incorrectly can in­
crease the risk of loss of control leading to
serious personal injury.
- Snow chains are available in different sizes. Always make sure to follow the in­
structions provided by the snow chain
manufacturer .
- When driving with snow chains never
drive faster than the speed permitted for
your specific snow chains.
- Always observe local regulations.
(D Note
- Remove snow chains before driving on
roads not covered with snow to avoid
damaging tires and wearing the snow
chains down unnecessarily.
- Snow chains, which come into direct con­
tact with the wheel rim, can scratch or
damage it . Therefore, make sure that the
snow chains are suitably covered . Check
the position of the snow chains after
driving a few yards and correct if neces­
sary. Follow the instructions from the
snow chain manufacturer when doing so.
(j) Tips
Where snow chains are mandatory oncer­
tain roads, this normally also applies to
vehicles with all wheel drive.
Tires and wheels 24 7
Wheel bolts
Wheel bolts must always be tightened to the
correct torque.
The design of wheel bolts is ma tched to the
factory inst alled rims. If different rims are fit­
ted, the correct wheel bolts with the right length and correctly shaped bolt heads must
be used. This ensures that wheels are fitted
securely and that the brake system functions
correctly.
In certain circumstances, you may not use
wheel bolts from a different vehicle -even if it
is the same model~
page 2 77.
&_ WARNING
Improperly tightened or maintained wheel
bolts can become loose causing loss of
control , a collision and serious personal in­
jury.
- Always keep the wheel bolts and the
threads in the wheel hubs clean so the
wheel bolts can turn easily and be prop­
erly tightened.
- Never grease or oil the wheel bolts and
the threads in the wheel hubs. They can become loose while driving if greased or
oiled, even if tightened to the specified
torque .
- Only use wheel bolts that belong to the
rim being installed .
- Never use different wheels bolts on your
vehicle.
-Always maintain the correct tightening torque for the wheel bolts to reduce the risk of a wheel loss. If the tightening tor­
que of the wheel bolts is too low, they
can loosen and come out when the vehi­
cle is moving.
If the tightening torque is
too high, the wheel bolts and threads
can be damaged and the wheel can be­
come loose.
(I} Note
The specified torque for the wheel bolts is
90 ft lbs . (120 Nm) with a tolerance of
± 7,4 ft lbs. (± 10 Nm). Torque wheel bolts .,..
•
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