2008 AUDI TT ROADSTER technical data

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& WARNING (continued)
• In a side collision, side airbags will not function properly if
sensors cannot correctly measure increasing air pressure inside
the doors when air escapes through larger, unclosed openings in
the door panel.
-Never drive with interior door trim panels removed.
- Never drive when parts have been removed from the inside
door panel and the openings they leave have not been properly
closed .
- Never drive when loudspeakers in the doors have been
removed unless the speaker holes have been properly closed.
- Always make certain that openings are covered or filled if additional speakers or other equipment is installed in the
inside door panels.
- Always have work on the doors done by an authorized Audi
dealer or qualified workshop. •
Controls and equip­ ment Safety first
Vehicle operation Vehicle care Do-it-yourself service Technical data

_____________________________________________ C_ h _ il_d _S_ a _ fe_t.....: y'----""
& WARNING
If , in e xceptional circum sta n ce s, y ou mu st in stall a forward -fa cing
c hild re straint on the front pa ssenger' s seat:
• Always m ake sure the forw ard-f acing se at has b een de signed
and cert ified by it s manufa cturer for use on a front seat with a
p ass eng er fro nt and side airbag .
• Alwa ys follow the manufacturer' s instruc tion s provided with
the child s afet y seat or carrier .
• Alway s move the p assenger sea t into it s rearmo st po sition in
the seat's fore and aft adjustme nt r ange , as far a way from the
airbag as po ssible before in stalling the child restraint. The ba ck­
rest must be adju sted to an upr ight p osition .
• Alway s m ake sure th at the PASSEN GER AIR BA G OFF l ight
c ome s on and stay s on all the time wheneve r the ignition is
s witched on. •
Advanced front airbag system and children
Your vehicle is equipped with a dual-stage front "Advanced Airbag
System" in comp liance with United States Federal Motor Vehicle
Safety Standard (F MVSS) 208 as applicab le at the t ime your vehic le
was manufactured .
The Advanced Airbag sys tem in yo ur vehicle has been cer tified to
meet the "low -risk" requirements for 3 and 6 year -old children on
the passenger side and small adults on the d river side. The low risk
deployment criteria are intended to reduce the risk of injury through
interaction with the airbag that can occur, for examp le, by being too
close to the steering wheel and instrument pane l when the airbag
inflates . In addition, the system has been certified to comp ly with
the "suppression" requirements of the Safety Standa rd, to turn off
the front airbag for infants up to 12 months who are restrained on
the front passenger sea t in child restraints that are listed in the
Standard .
Controls and equip­
ment Safety first Vehicle operation
Even though your vehicle is equipped with an Advanced Airbag
system, a child should always ride in theseat pr operly restrained for
its age and size. The airbag on the passenger side makes the front
seat a potentially dangerous place for a child to ride. The front seat
is not the safest place for a child in a forward -facing child safety
seat . It can be a very dangerous p lace for an infant or a larger child
in a rearward -facing seat. •
Advanced Airbags and the weight -sensing
mat in the front seat
The Advanced A irbag System in your vehicle detects the presence
of an infan t or child in a chi ld rest rain t on the front passenger seat
using the weight -sensing mat in the seat cushion and the sensor
below the safety belt latch on the front passenger seat that
measures the tension on the sa fety belt.
The weight -sensing mat measures total weight of the child and the
child safety seat and a chi ld blanke t on the front passenger seat . The
weight on the front passenger seat is related to the design of the
child res tra int a nd i ts "footprin t", the size and shape o f the b ottom
of the child restraint as it sits on the seat . T he weight of a child
restra in t and its " footprint" va ry for different kinds of ch ild
restraints and for the different models of the same kind of chi ld
restraint offered by child restraint manufacturers .
The weight ranges for the ind ividual types, makes and models of
child restraints that the NHTSA has specified in the Safety Standard
t ogether with the weight ranges of typical infan ts and typica l 1 year ­
old chi ld have been stored in the control unit of the Advanced
Airbag Sys tem. When a child res traint is being used on the front
passenger seat with a typical 1 year-old chi ld, the Advanced Airbag
System compares the weight measured by the we ight sensing ma t
with the information stored in the e lectronic control unit.
The electronic contro l unit also registers the tension on the front
passenger safe ty bel t. The tension on the safety be lt for the front
passenger seat will be different for an adult who is properly using •
Vehicle care Do-it-yourself service Technical data

Child Safety -
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& WARNING
To reduce the risk of serious injury, make sure that the PASSENGER
AIR BAG OFF light comes on and stays on whenever a child restraint is installed on the front passenger seat and the ignition
is switched on.
• Never install a rearward facing child safety seat on the front
passenger seat unless the PASSENGER AIR BAG OFF light comes
on and stays on. If the PASSENGER AIR BAG OFF light does not
come on and stay on the inflating airbag will hit the child safety
seat or infant carrier with great force and will smash the child
safety seat and child against the backrest, door or roof. Have the
airbag system inspected immediately by your Audi dealer.
[ i] Tips
The child seats listed in categories A to C have been tested by Audi
only for the Advanced Airbag function. •
Important safety instructions for
using child safety seats
Correct use of child safety seats substantially reduces the
risk of injury in an accident!
As the driver, you are responsible for the safety of every ­
body in the vehicle, especially children:
- Always use the right child safety seat for each child and
always use it properly ::::>
page 173.
-Always carefully follow the child safety seat manufac­
turer's instructions on how to route the safety belt prop­
erly through the child safety seat.
Controls and equip­ ment Safety first Vehicle operation
-
When using the vehicle safety belt to install a child safety
seat, you must first activate the convertible locking retractor on the safety belt to prevent the child safety
seat from moving ::::>
page 177.
-Push the child safety seat down with your full weight to
get the safety belt really tight so that the seat cannot
move forward or sideways more than one inch (2.5 cml.
Always remember: Even though your vehicle is equipped with an
Advanced Airbag system, a child should always ride in the seat
properly restrained for its age and size.
& WARNING
Not using a child safety seat, using the wrong child safety seat or
improperly installing a child restraint increases the risk of serious
personal injury and death.
• All vehicle occupants and especially children must always be
restrained properly whenever riding in a vehicle.
-An unrestrained or improperly restrained child can be injured
or killed by being thrown against the inside of the vehicle or by
being ejected from it during a sudden maneuver or impact.
- An unrestrained or improperly restrained child is at much
greater risk of injury or death by being struck by an inflating
airbag.
• Commercially available child safety seats are required to
comply with U.S. Federal Motor Vehicle Safety Standard (FMVSS)
213 (in Canada CMVSS 213).
- When buying a child restraint, select one that fits your child
and the vehicle.
- Only use child restraint systems that fully contact the flat
portion of the seat cushion. The child restraint must not tip or
lean to either side. Audi does not recommend using child safety
seats that rest on legs or tube-like frames. They do not provide
adequate contact with the seat. ..
Vehicle care Do-it-yourself service Technical data

_______________________________________________ C_h _ i_ld _ S_ a_ f_ e_ t..,:c y __ __
& WARNING
Rearward-facing child restraints:
• A child in a rearward-facing child safety seat installed on the
front passenger seat will be seriously injured and can be killed if
the front airbag inflates -even with an Advanced Airbag System.
• The inflating airbag will hit the child safety seat or infant
carrier with great force and will smash the child safety seat and
child against the backrest, door or roof.
• Always be especially careful if you must install a rearward
facing child safety seat on the front passenger seat in exceptional
circumstances.
• Make sure that the PASSENGER AIR BAG OFF light comes on
and stays on all the time whenever the ignition is switched on.
• Never install a rearward facing child safety seat on the front
passenger seat unless the PASSENGER AIR BAG OFF light comes
on and stays on. If the PASSENGER AIR BAG OFF light does not
come on and stay on have the airbag system inspected immedi ­
ately by your Audi dealer. •
Activating the convertible locking retractor
Use the convertible locking retractor to secure a child
restraint.
Always heed the child safety seat manufacturer's instruc ­
tions when installing a child restraint in your vehicle . To
activate the convertible locking retractor:
- Place the child restraint on a seat .
- Slowly pull the belt
all the way out.
- Route it around or through the child restraint belt path
~& -
Controls and equip­
ment Safety first
Vehicle operation
-Push the child safety seat down with your full weight to
get the safety belt really tight.
- Insert the belt tongue into the buckle for that seating
position .
- Guide the safety belt back into the retractor unt il the belt
lies flat and snug on the child safety seat.
- You should hear a "clicking" noise as the belt winds back
into the inertia reel. Test the convertible locking retractor
by pul ling on the belt. You should no longer be able to
pull the belt out of the retractor. The convertible locking
retractor is now activated .
- Make sure that the red release button is facing away from
the child restraint so that it can be unbuckled quickly.
- Pull on the belt to make sure the safety belt is properly
tight and fastened so that the seat cannot move forward
or sideways more than one inch (2.5 cm).
& WARNING
Using the wrong child restraint or an improperly installed child
restraint can cause serious personal injury or death in a crash.
• Always make sure that the safety belt retractor is locked when
installing a child safety seat. An unlocked safety belt retractor
cannot hold the child safety seat in place during normal driving or
in a crash.
• Always buckle the child safety seat firmly in place even if a
child is not sitting in it. A loose child safety seat can fly around
during a sudden stop or in a crash.
• Always make sure the seat backrest to which the child restraint
is installed is in an upright position. Otherwise, the seat back with
the child safety seat attached to it could fly forward in the event of
an accident or other emergency situation. ..,
Vehicle care Do-it-yourself service Technical data

_______________________________________________ C_h _ i_ld _ S_ a_ f_ e_ t..,:c y __ lllll
Audi Client Relations
Tel.: (800) 822 -2834
a
Controls and equip­
ment Safety first
Vehicle operation Vehicle care Do-it-yourself service Technical data

the vehicle begins to skid, ESP brakes the appropriate wheel auto­matical ly .
The vehicle is stabilized again by the forces acting on the wheel during braking. With an oversteering vehicle (tendency for the rear
end to skid out of the curve), the brake application is mainly at the
front wheel on the outside of the curve, with an understeering
vehicle (tendency to run wide in the curve) at the rear wheel on the
inside of the curve or additionally at the other wheels as needed .
This brake application is accompanied by noises.
ESP works in conjunction with ABS=:>
page 189. If there is ma lfunc­
tion in the ABS, ESP is also inoperative .
Activa ting
The ESP is automatica lly activated when the engine is started, and
it performs a self-test. As soon as the test is completed, the system
is in normal operating mode . With ASR deactivated, or with ESP/ASR
deactivated, pressing the button=>
page 184, fig. 142 returns the
system to normal operation.
D eac tiva ting
ESP should norma lly be activated at all times because this ensures
optimum vehicle stability . Only in certain exceptional cases it does
make sense to deactivate Anti -Slip Regulation (ASR) or the Elec ­
tronic Stability Program !ESP) by pressing the button =:>
page 184,
fig. 142. Both deactivation stages can only be activated from normal
mode.
Dea cti vat ing ASR
Tap the switch . Deactivation is indicated by s low flashing of the ESP
lamp in the instrument c luster. In certain situations (e.g. driving
with snow chains, in deep snow or on loose ground, or when rocking the car free), it may be necessary to deactivate ASR. Deacti ­
vation is effective only up to a speed of about 45 mph (70 km/h). At higher speeds, ASR is switched on again automatical ly in front ­
whee l drive vehicles, deactivation is possible only up to about 30
mph (50 km/h). With a ll -whee l drive vehicles, ASR is active above
Controls and equip­
ment Safety first Vehicle operation
In
te llig ent tec hn olo gy
about 45 mph (70 km/h) and deactivated automatical ly below this
speed.
D eac tiva tin g ES P/ASR
Press the button for more than 3 seconds . Deactivation is indicated
by the ESP lamp in the instrument c luster staying on permanently .
This deactivates the E lectronic Stabi lity Program (ESP) in addition to
ASR . No Electronic Stability System operation and no Anti-Slip
Regu lation is availab le across the entire speed range; ASR and ESP
are activated only when the brakes are used for the duration of the
braking action and remain active until a stab le vehicle condition has
been reached. There is no driving situation which requires ESP to be
deactivated, so this should only be done if the driver's skill and the
traff ic situation permit .
& WARNING
• The limi ts of ph ysics ca nnot be suspe nd ed by E SP. E ven in vehi ­
cles w ith ESP, you should always adapt your dr iving to road and
tr affi c co ndition s. Thi s is part icul ar ly tr ue on a s lippe ry and wet
road . Do not be te mpt ed b y th e incre as ed safet y prov ided t o ta ke
ri sks - dang er of an accident !
• Plea se note that when ASR or ESP /ASR i s deactivated , the drive
w heel s can spin on icy and slipper y ro ad s and the vehi cle can
break away - da nger of skiddin g!
Ii ] Tip s
In the event of a defect in the rear spoiler system or in Audi
magnetic ride, it can happen that ASR and ASR/ESP cannot be deac ­
tivated, or they are activated automatica lly in the deactivated
state. •
Vehicle care Do-it-yourself service Technical data

Faults in the brake syst em
If you shou ld notice a sudden i ncrease in brake pedal travel, then
one of the two brake circuits may have failed=>
& -
Low brake fluid level
Ma lfunctions can occur in the brake system if the brake fluid leve l is
t oo low. The brake fluid level is moni tored e lect ronica lly .
Brake pow er assist unit
The brake p ow er assist un it increas es th e pressure that you
generate with the brake peda l. It works only when the engine is
running.
& WARNING
• You should perform braking maneuver s for the purpose of
c leaning the brake system only if road conditions permit . Other
road users must not be put at ri sk -you may cause an accident!
• Before des cending a steep grade , redu ce speed and sh ift trans­
mi ssion into a lower gear or lower driving position . Do not ride the
br akes or hold the pedal down too long or too often . This could
cause the brakes to get hot and diminish braking efficiency .
• Do not "ride the brakes " by resting your foot on the pedal when
you do not intend to brake . Thi s may cause the brakes to overheat,
premature we ar and increased stopping distan ce .
• Under certain cl imatic and operating condit ions such as
pas sing through water , driv ing in heavy rain or after washing the
vehicle, the effectiveness of the brake s can be reduced . In winter ,
ice can ac cumulate on the brake pads , linings , discs and drums .
Cautiously apply brakes for a te st. Brakes will dry and ice coatings
will be cleaned off after a few cautious brake appli cations .
• Driving for an extended period of time on salt -covered road s
without using your brakes can also affect brak ing effic iency . Clean
off accumulated salt coating from brake discs and pads with a few
c autiou s brake applications .
Controls and equip­ ment Safety first Vehicle operation
Intelligent technology
& W
ARNING (continued )
• If you damage the front spo iler , or if you install a different
s poiler , be sure the air flow to the front brakes is not obstructed.
Otherwise the brake system could overheat redu cing the effective­
ness of the entire br ake system.
• Failure of one brake circuit will impair the braking capability
resulting in an increa sed stopping distance. Avoid driving the
vehicle and have it towed to the nearest Audi dealer or qualified
workshop.
• Never let the veh icle roll to a stop with the engine shut off .
• If the b rake booster is not working , for e xample when towing
your vehicle, or because the brake booster has somehow been
damaged , the brake pedal must be pre ssed considerably harder to
make up for the lack of booster assistance . •
Anti- lock brake system (ABS)
ABS p revents the wheel s from loc king unde r br ak ing.
The anti -lock brake sys te m (ABS) makes a major contri but ion to
i ncreasing act ive d riv in g sa fety . You should not expect that brakin g
distances wi ll be
shortened unde r all c ircums tances wi th ABS.
B rak in g distance may even become somewhat
longer , for e xa m ple ,
on gravel or in new snow on s lippery ground, even if you are driving
carefully and slowly.
ABS operation
W hen a veh icle speed o f about 10 mph (20 km/ h) is reac hed , an au to ­
matic test sequence is run. Some noise from the pum p may be
audible.
I f the speed of a wheel s lows down too much re lative to vehicle
speed and i t starts to lock, br ake pressu re to th is whee l is reduce d.
T his adjustment process can be felt as a
pulsing motion of the b rake
pedal ,
accompanied by some noises. Yo u as the d rive r are in tent io n­
a lly being g iven the in fo rmation that the wh eels a re tendin g to lock
Vehicle care Do-it-yourself service Technical data

[ i ] Tips
• If the pow er st eering sy stem sho uld fa il, or if the e ng ine is not
running (for examp le , whi le being towed), you will stil l be able to
st eer the ve hicle . How eve r, more e ffort w ill be required to do so.
• I f the powe r steering system is not f unctioning pr ope rly, contact
your authorized Audi dea ler immediate ly.
Ap plies to vehicles : wit h A ll Wheel Driv e
Driving w ith your quattro®
With All Wheel Drive, all four w heels ar e dri ven.
General information
With All W hee l Dr ive, power is d is tr ibute d to all fou r whee ls . T his
happens automat ica lly depending on your driving style and the
r oad cond itio ns at the time. See also =>
page 186, "E lec tronic diffe r­
entia l lock ( EDU" .
Winter tires
When driving in the winter, your vehic le with All Wheel Drive has an
advantage, even wi th regula r t ir es . In winter road conditions it may
be advisable to mount winter tires (or all -season tires) for improved
driveabi lit y an d braking : these tires m ust be mounted on
all four
wheels .
See also=> page 254 , "Win ter t ires" .
Snow chains
Where tire cha ins are mandatory on certain roads, this normally
a lso a pplies t o vehic le s wi th Al l Wheel Drive =>
page 255, "Sn ow
chains".
Replacing wheels /tires
Vehicles with A ll Wheel Drive must always have tires of the same
s iz e. Also av oid t ires w it h d iff eren t tr ead dep ths. For details see
page=>
page 249, " New tires and replacing tires and whee ls " .
Controls and equip­
ment Safety first Vehicle operation
Intelligent technology
Off
-Road driving?
Your Audi d oes not have en ough gr ound clea rance to be use d as a n
off -road vehicle. It is therefore best to avoid roug h tracks and
u neven terrain as much as possible. A lso refer to=>
page 194.
& WARNING
Always adjust your driving to road and traffic conditions. Do not
let the extra safety afforded by All Wheel Drive tempt you into
taking extra risks .
• Although the All Wheel Drive is very effective , always
remember that braking capacity is limited by tire traction. You
should therefore not drive at e xcessive speeds on icy or slippery
road surfaces.
• On wet road su rfaces , be careful not to dr ive too fast because
the front wheels could begin to slide on top of the water (aqua ­
planing ).
If this should occur , you will have no warning from a
sudden increase in engine speed as with a front -wheel drive
vehicle . Always d rive at speeds which are suited to the road condi­
tions. -risk of cra sh. •
Vehicle care Do-it-yourself service Technical data