Page 185 of 244

In a se ale d system, losses can occur only if
the boiling point of the coolant is exceeded as
a result of overheat ing.
A WARNING
- The cooling system is under press ure. Do
not open the cap of the coolant expan
sion tank when the eng ine is hot. You
risk being scalded .
- The coo lant add itive, and therefore the
coolant itse lf, is hazardous to health.
Keep the coolant additive in the origina l
co nta iner out of the reach of children.
It
is a poison hazard.
CD Note
Do not add any type of rad iator leak seal
ant to your vehicle's eng ine coolant. Add
ing radiator repair f luid may adve rsely af
fect the fu nction and performance of your
coo ling system and could res ult in damage
not covere d by your New Vehicle Limited
Warranty .
Adding coolant
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 175 .
.. Add coolant .
.. Tw ist the cap on again
t ightly.
.. Tighte n the cap (D ¢ page 182, fig. 146
again .
Replacement engine coolant must conform to
exact specifications ¢
page 181, Coolant. If
the coolant additive Gl2++ is not available in
an emergency, you must not add any other ad
d itive . In th is case, use only water and restore
the co rrec t mix ratio wi th the specified cool
ant add itive as soon as possib le.
Always use
new engine coolant when ref illing .
Do not fill coolant above the " MAX" mark. Ex
cess coolant will be forced out through the p ressure relief valve i n the cap when the en
g ine becomes hot .
Checking and fillin g 183
With a major loss of coolant, you shou ld add
the coolant only when the engine has
cooled.
In this way you prevent engine damage.
A WARNING
- The cooling system is unde r pressure and
can get very hot. Reduce the risk of
scalding from hot coolant by followi ng
these steps .
- Turn off t he engine and allow it to coo l
down.
- Protect you r fa ce, hands and arms from
escaping fluid and steam by covering
the cap with a large, th ic k rag.
- Turn the cap s lowly and very carefully
in a counter -clockwise direction while
applying light, downward pressure on
the top
of the cap.
- To avoid being bu rned, do not spill an
tifreeze or coolant on the ex haust sys
tem or hot engine pa rts. Under certain
cond itions, the ethylene glycol in en
gine coolant can catch fire .
- Antifreeze is poisonous . Always store an
tifreeze in its origina l container and well
out of the reach of children .
- If you dra in the coo lant, it m ust be
caught and safely stored in a proper con
taine r clearly marked " poison" .
CD Note
- Coolant pollutes the environment and
cou ld cause an engine fire. Excess cool
ant will be forced out through the pres
sure relief valve in the cap w hen the en
gine becomes hot .
- If, in an eme rgency, o nly wate r can be
added, the co rrec t ratio between wa ter
and antifreez e
¢page 181 must be re
stored as soon as poss ible.
@) For the sake of the environment
D ra ined coola nt sho uld not be reused. Al
ways d ispose of used coolant while observ
i ng a ll environmental regula tions. •
•
Page 186 of 244

184 Checking and filling
Brake fluid
Notice
Have the brake fluid changed by an experi
enc ed technician .
Brake fluid abso rbs moisture from t he a ir. If
the water content in the brake fluid is t oo
high, corrosion in the brake system may result
after a per iod of t ime . The bo iling po int of the
brake fluid w ill also decrease considerably and
dec rease b rak ing performance.
Therefore, the brake flu id must be changed
e ver y two y ear s. Always use new brake fluid
which confo rms to Fede ral Motor Vehicle
Standa rd "FMVSS 1 16 DO T 4".
Brake fluid is rep laced according to the Audi
maintena nce service schedule . Your author
ized Audi dealer is equipped with the necessa
ry special tools and rep lacement parts , has
the necessary expe rtise, and c an d ispose of
the used fluid .
& WARNING
-Brake fluid is po isonous. It must be sto r
ed on ly in the closed orig inal container
o ut o f the reach of children!
- Brake fa ilure can result from old or inap
propriate b rake fluid . Observe these pre
caut ions:
- Use only bra ke fluid that meets SAE
specifi cation
J 1 703 and co nfo rms to
F ederal Motor Vehicle St andard 116 .
A lways check with you r a uthorized Aud i
dea ler to make s ure you are using the
correct brake fl uid. T he correct type of
brake fluid is a lso 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 fl uid is left in the system too
long . This can ser ious ly affect the effi
cie ncy of the bra kes as well as yo ur
safety. This could result in an acc ident .
(D Note
Brake fluid will damage the paint of you r
vehicle .
@ For the sake of the environment
Because o f the prob lem of p rope r disposal
of brake fluid as well as the spec ial too ls
r equired and the necessary expertise, we
recommend that yo u have the brake fl uid
changed by yo ur authorized Aud i dea le r.
Battery
General information
All work on the battery requires technical
knowledge.
The battery is located behind the cover i n the
l uggage compa rtme nt. Remove the cover by
pushing it to the left and lift ing it o ut.
The battery is practically maintenance-free
and is checked as pa rt of your ve hicle's main
tenance se rv ices .
You are we ll advised to replace a battery that
is older than S years .
Disconnecting the battery terminal s
Some vehicle functions (power window reg u
lators, for example) are lost if the battery te r
mina ls are disconnected . T hese functions have
to be relearned after the battery termina ls are
connected again . To prevent th is, the battery
shou ld only be disco nnected from the ve hicle
electrica l system when abso lutely necessary
f o r repai rs.
Vehicles not driven for long periods
The battery becomes d ischarged due to quies
cent current consume rs even when the vehicle
i s not used . With extended pe riods of non-use
i n the
cold season, you should have the ve hi
cl e battery removed by an autho rized Aud i
de aler or qu alified workshop and stored in an
frost -free place. This preven ts the battery
from "freezing" and thereby being dest royed.
D uring the
warmer seasons it is eno ugh to liJ>
Page 187 of 244

disconnect the battery negative terminal. Oc
casionally charge a disconnected battery.
Winter operation
The cold time of year places a special strain on
the battery, resulting in reduced starting pow
er. So before the cold weather starts, have the battery inspected and charged as necessary.
A WARNING
- All work on the battery requires technical
knowledge. Please contact an authorized
Audi dealer or another authorized facility
for questions about the battery - danger of acid burns and explosion hazard!
- The battery must not be opened! Do not
try to change the battery's liquid level,
otherwise detonating gas will escape
from the battery - explosion hazard!
Working on the battery
Always wear eye protection.
Battery acid contains sulfuric
acid. Always wear gloves and eye
protection.
No
- sparks
- flames
- smoking.
When a battery is charged, it pro
duces hydrogen gas which is ex plosive and could cause personal
injury.
Always keep the battery well out
of reach of children.
The following WARNINGS are very important
when working on the battery:
A WARNING
Whenever working on the battery or on
the electrical system, there is the risk of
injury, accident and even fire. Read and
heed the following WARNINGS:
-
Checking and filling 185
- Always wear eye protection. Do not let
battery acid or any lead particles get on
your skin or clothing. Shield your eyes. Explosive gases can cause blindness or
other injury.
- Battery acid contains sulfuric acid. Sulfu
ric acid can cause blindness and severe
burns.
- Always wear gloves and eye protection.
Do not tilt the battery because acid
could leak out of the ventilation open
ings.
- If you get battery acid in your eyes or
on your skin, immediately rinse with
cold water for several minutes and get
medical attention.
- If you should ingest any battery acid,
seek medical attention immediately.
- Do not expose the battery to an open
flame, electric sparks or an open light.
- Do not smoke.
- Do not interchange the positive and neg- ative cables.
- When working on the battery, be sure
not to short-circuit the terminals with
tools or other metal objects. This would cause the battery to heat up very quickly,
which could lead to damage or explosion and personal injury.
- When a battery is charged, it produces
hydrogen gas which is explosive and
could cause personal injury.
- Always keep the battery well out of the
reach of children.
- Before work is done on the electrical sys
tem, disconnect the negative ground ca
ble.
- Before performing any work on the elec
trical system, switch off the engine and
ignition as well as any electrical equip
ment. The negative cable on the battery
must be disconnected.
If you are just go
ing to replace a light bulb, then it is
enough to switch off the lights.
- Before disconnecting the battery, switch
off the anti-theft alarm system! Other
wise you will set off the alarm. •
•
Page 188 of 244

186 Checking and filling
-When disconnecting the battery, first
disconnect the negative cable and then
the positive cable.
- Before reconnecting the battery, make
sure all electrical consumers are switch ed off. Reconnect the positive cable first
and then the negative cable. Never inter
change the cables -this could start a fire!
- Never charge a frozen or a thawed-out
battery. It could explode!
If a battery has
frozen, then it must be replaced. A dis
charged battery can freeze over at 32 °F
(0 °C).
-Make sure the vent hose is always attach
ed to the opening on the side of the bat
tery.
- Never use batteries which are damaged.
Danger of explosion! Always replace a
damaged battery .
.&, WARNING
California Proposition
65 Warning:
- Battery posts, terminals and related ac
cessories contain lead and lead com
pounds, chemicals known to the State of
California to cause cancer and reproduc
tive problems. Wash hands after han
dling.
(D Note
- Do not disconnect the vehicle battery
when the ignition is switched on or when
the engine is running, otherwise, you will
damage electronic components in the
electrical system.
- If your vehicle is going to stand for a
long period of time without being driven,
protect the battery from "freezing", oth
erwise it will be damaged and will then have to be replaced. Charging the battery
Connections for
charging the battery are lo
cated in the luggage compartment.
Fig. 147 L uggage compartment: battery cover
Fig. 148 Luggage compartment: connectors for a
charger and jump start cables
Do not connect the negative cable directly to
the negative terminal on the battery. Connect
it to a
jump start pin instead c:, fig. 148.
.,. Always read and heed all WARNINGS c:, A
in Working on the battery on page 185 and
¢ A -
... Switch off the ignition and all electrical con
sumers .
.,. Open the luggage compartment lid
c:>page42 .
.,. Remove the battery cover c:, fig. 147.
.,. Connect the terminal clamps from the
charger to the battery terminal (red= "posi
tive") and the jump start pin
c:, fig. 148
(black or brown= "negative") as specified.
.,. Only now plug the mains lead for the charg
ing equipment into the wall outlet and turn
it on .
.,. When the battery is fully charged: Turn the
charging equipment off and remove the
mains lead from the wall outlet .
.,. Now remove the clamps for the charging
equipment.
Page 189 of 244

~ Install the battery cover.
~ Close the luggage compartment lid
¢page 42.
When charging at low voltages (e.g. with a
trickle charger), the battery cables do not
have to be disconnected first. Before charging
at
high voltages, i.e. "fast charging", you
must disconnect both cables. In either case,
follow the instructions from the manufacturer
of the charger .
Fastcharging a battery is
dangerous ¢.&. in
Working on the battery on page 185 .
It re
quires special charging equipment and the knowledge to go with it. We recommend hav
ing your battery fast charged only by a quali
fied workshop.
A discharged battery can
freeze at tempera
tures of only 32 °F (0 °C) . Allow a frozen bat
tery to thaw completely before attempting to
charge it¢ ,&. . However, we recommend not
using a thawed battery again because the bat
tery casing can be cracked due to ice forma
tion and can leak battery acid.
Do not open the battery caps when charging
the battery.
_& WARNING
-
Charging a battery can be dangerous.
- Never charge a frozen battery .
It may ex
plode because of gas trapped in the ice.
Allow a frozen battery to thaw out first.
- Do not reuse batteries which were fro
zen. The battery housing may have
cracked and weakened when the battery
froze.
- Charge the battery in a well ventilated
area. Keep away from open flame or elec
trical spark. Do not smoke. Hydrogen gas
generated by the battery is explosive.
- To reduce the danger of explosion , never
connect or disconnect charger cables
while the charger is operating.
- Fast charging a battery is dangerous and
should only be attempted by a compe
tent technician with the proper equip ment.
Checking and filling 187
- Battery acid that may spill during charg
ing should be washed off with a solution
of warm water and baking soda to neu
tralize the acid .
@ Note
Never use a fast charger as a booster to
start the engine. This will seriously dam
age sensitive electronic components, such
as control units, relays, radio, etc ., as well
as the battery charger .
(D Tips
-The vehicle battery must not be charged
with a standard small charger that plugs
into the cigarette lighter or outlet .
- Only charge the battery through the con
nections in the luggage compartment.
Replacing the battery
The new battery must have the same specifi
cations as the old one.
Your vehicle is equipped with an intelligent
energy management system for distributing
electricity ¢
page 155. The battery charges
better in vehicles with the energy manage
ment system than in vehicles without the sys
tem. To ensure that the additional power is
available after replacing the battery , replacing
with the same type of battery from the same
manufacturer (like the battery that was deliv
ered with the vehicle) is recommended. An au
thori zed dealer mus t code the battery in the
energy management control module .
T he new battery must have the same capacity,
voltage (12 volts), current and design and it
must be sealed with plugs. The battery must
conform to the standards TL 825 06 (from Oc
tober 2006) and VW 7 50 73 (from August 2001).
Since the vehicle battery is difficult to reach,
we recommend having the battery replaced by
an authorized Audi R8 dealer or other quali-
fied workshop . ..,. •
•
Page 190 of 244

188 Checking and filling
(D Note
-Your vehicle is equipped with a specia l
battery. Installing a different type of
battery can cause prob lems in the vehi
cle electrical system. When replacing the
vehicle battery, always install one with
the same spec ificat ions as the original
batte ry .
- Make sure that the gas venting hose is
always connected to the o riginal open ing
on the battery side. Otherw ise gasses or
ba tte ry acid cou ld leak out .
- Battery ho lder and term inals a lways
have to be secured cor rectly.
- Read and follow the warnings under
9 page 185, Working on the battery be
fore performing any work on the batte ry.
@ For the sake of the environment
Because of the problem of proper disposal
of a battery, we recommend your author
ized Audi dealer change the batte ry for
you . Batter ies contain s ulf uric ac id and
lead and must always be disposed of prop
erly in compliance with all environmenta l
reg ulations. D isposing of vehicle batteries
improperly is very dangerous to the envi
ronment. Make sure that the removed bat
tery ca nnot overbalance, otherwise sulfu
r ic acid might escape!
Windshield washer
container
Fig. 149 Luggage co m pa rtment : W inds hield washer
fl uid reservo ir
T he windshield washer container O is located
in the luggag e compartment. You can find the
reservo ir
c a pacit y in the table in c::> page 229.
Clean water should be used when filling up. If
possible, use soft water to prevent scaling on
the washer jets . Always add a glass cleaner
solution (with frost protection in the winter) .
(D Note
-Do not mix engine coolant antifreeze or
any other additives to fill up the wind
shield washer reservoir.
- Do not use g lass cleaners conta ining
pai nt so lvent; you risk damaging the
paint.
Page 191 of 244

Tires and wheels
Tires
General notes
Tires may be the least appreciated and most
abused parts of a motor vehicle .
Tires may be the least appreciated and most
abused parts of a motor vehicle . T ires are,
however, one of the most important parts of a
vehicle, particularly considering the compara
tively small patch of rubber on each tire that
assures that a ll- important contact between
you, you r vehicle and the road.
Maintaining the correct tire pressure, mak ing
sure that your vehicle and its tires do not have
to carry mo re weight than they can safely han
d le, avoiding damage from road hazards and
r eg ularly inspect ing t ires for damage i nclud
ing cuts, slashes irregu la r wear and ove rall
condition are the most important things that
you can do to he lp avoid s udden tire failure in
cluding tread separat ion and blowouts.
A voidin g damage
If yo u have to d rive over a curb or similar ob
stacle, drive very slow ly and as close as possi
b le at a right angle to the curb.
A lways keep chemicals incl ud ing grease, o il ,
gasoline and brake fluid off the t ires .
I nspect the t ires regularly for damage (cuts,
cracks or b listers, etc.). Remove any fo reign
bod ies embedde d in the treads.
Storing tires Mark tires when you remove them to indicate
the direction of rotation . T his ensures you to
be ab le to mount them correctly when you re
i nstall them .
When removed, the whee ls or t ires should be
sto red in a cool, d ry and preferably dark place .
Store tires in a vertical pos ition if they are not
mounted on r ims, in a horizontal pos it ion if
they are mounted on rims .
Tires an d wheel s 189
New tires
New ti res h ave to be broken in~& .
The tread depth of new t ires may vary, accord
ing to the type a nd make of t ire and the tread
patte rn.
H idden damage
Damage to tires and r ims is ofte n not readily
visible . If you notice unusual v ib rat ion or the
vehicle pulls to one s ide, th is may ind icate
that one of the t ires has been damaged . T he
ti res m ust be chec ked immed iate ly by an au
thorized Audi dea le r or q ua lified wor kshop .
Unidirectional tires
A un idirectional tire can be identified by ar
rows on the sidewa ll, that po int in the direc
tion the t ire is designed to rotate. You must
f ol low the specified di rection o f rotation . T his
is necessary so that these tires can develop
their optimum characteristics regarding grip,
road noise, wear and hydrop laning resistance.
For more information
~ page 216.
A WARNING
New tires or t ires that are o ld, worn or
damaged cannot provide maximum con
trol and braking ability .
-
-New tires tend to be slippery and must
be broken in. To reduce the r isk of losing
control, a co llision and ser ious personal
in ju ries, d rive with special ca re for the
fi rst 350 m iles ( 560 km).
- Driving with worn or damaged tires can
lead to loss of control, sudden tire fail
ure, including a blowout and sudden de
fl ation, cras hes and se riou s personal in
juries . Have wo rn or damaged t ires re
placed immediate ly.
- Ti res age even if they are not being used
and can fail sudden ly, especially at hig h
speeds. Tires that are more than 6 years
old can only be used in an emergency
and then w ith special care and at low
speed.
•
•
Page 192 of 244

190 Tire s and wheel s
-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.
Glossary of tire and loading terminology
Accessory weight
means t he comb ined we ight (in excess of
those standard items which may be rep laced)
of R t ron ic, powe r stee ring, powe r brakes,
power w indows , power sea ts, r ad io , a nd hea t
e r, to the extent that these i tems are available
as facto ry -in stalled equipment (whether in
stalled or not).
Aspect ratio
means t he ratio o f the heigh t to the w idth of
the tire in percen t. Numbers of 55 or lower in
d icate a low sidewall fo r improved s teer ing re
sponse and better overall handling on dry
pavement.
Bead
means t he pa rt of the t ire that is made o f
steel wires, wrapped o r reinforce d by p ly cor ds
and that is shaped to fi t the r im.
Bead separation
means a b reakdown of the bond between
components in the bead.
Cord
means the s trands forming the plies in the
tire .
Cold tire inflation pre ssure
means t he tire pressure recommended by the
ve hicle manufacture r for a tire of a designated
si ze that has not been dr iven for more than a
couple of miles (kilometers) at low speeds in
the three hour period before the tire pressure i s measu red or adjusted. -
If you notice un usua l vibration or if the
veh icle pulls to one side when driv ing, a l
ways stop as soon as it is safe to do so and check the wheels and tires for dam
age.
Curb weight
means the we ight of a motor ve hicle w ith
standard equipment includ ing the max imum
capa city of fuel, o il, and coolant, a ir cond i
ti on ing and addi tional weig ht o f option al
equipmen t.
Extra load tire
means a tire designed to operate at higher
loads and at highe r inflat ion p ress ures tha n
the cor responding standard tire . Extr a load
t ir es my be i dent ified as "XL", "xl", "E X T RA
LO AD", or "RF" on t he sidewall.
Gross Axle Weight Rating ( "GAWR ")
means the load-carry ing capacity of a s ingle
axle system , measured at the tire-ground in
te rfaces .
Gross Vehicle Weight Rating ( "GVWR ")
means the maximum total loaded we ight of
the vehicle.
Groove
means the space between two adjacent tread
ribs .
Load rat ing (code )
means the maximum load that a tire is rated
to carry fo r a given inflation press ure. Yo u
may not fi nd this information on all tires be
ca use it is not required by law.
Maximum load rating
me ans the lo ad r ati ng for a tire a t the m axi
mum perm issib le inf lation pressure for that
ti re .