2011 AUDI Q7 traction control

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fore-and-aft and lateral directions, the brake pressure and the
steering angle are all measured.
The direction in which the driver wishes to travel is determined with
the aid of the steering angle and vehicle speed and is continually
compared with the actual behavior of the vehicle. If the two do not
match, for example, when the vehicle starts hydroplaning on a wet
road, ESP will automatically brake the appropriate whee l to correct
the problem.
The vehicle is then stabi lized by the forces acting on the whee l during
braking. If the vehicle is
oversteering (rear tends to skid out of the
turn), the brakes are main ly applied on the wheel that is on the
outs ide of the curve. In the case of a vehicle that is
understeering
(tendency to slide out of the curve), the brakes are applied as needed
on the wheel that is on the inside of the curve or additionally on the
other wheels. An acoustic s ignal indicates when ESP brake application
cuts in=> &.
The system operates across the entire speed range in combination
with the ABS system ~
page 260 . If the Anti -Lock Brake System
(ABS) ma lfunctions, the ESP wi ll be out of action as well.
Activating
When you turn on the engine, ESP will automatically be activated and
wi ll perform a self-test. As soon as the test is comp leted, the system
is in normal operating mode .
Offroad mode
ESP should normally be operated in normal mode because this
ensures maximum vehicle stability. If necessary, you can activate the
ESP offroad mode by pressing the button=>
page 256, fig. 222 to
obtain maximum traction and braking ability when driving off paved
roads at low speeds. In ESP offroad mode, the indicator light illu­
minates and the message
ESP Offroad Caution! Limited driving
stability
appears briefly in the d isp lay.
The ESP offroad mode can be useful in the following exceptiona l situ­
ations when slip or a highly effe ctive different ial loc king funct ion is
desirable. Examples:
Controls and equip­ ment Safety first Vehicle operation
•
when driving w ith tire chains,
• when driving in deep snow or on loose ground,
• when driving on uneven surfaces with the wheels severely
unloaded (articulation), and
• when rocking the vehicle loose a fter it has become stuck.
When the unusual situation is past, you should sh ift back to the
normal ESP operating mode by pushing the button again. The
message
ESP/ ASR on then appears briefly in the display.
Hill descent control
The hill descent control is switched on in ESP offroad mode. When
slowly descending steep gradients on loose ground or when the axles
are art iculated, hill descent control provides assistance by automati­
cally applying the brakes to keep vehicle speed constant. The vehicle
is also rende red easier to steer by select ive distribution of braking
force. Hill descent control intervenes when:
• the accelerator pedal is not pressed,
• the vehicle is travelling less than 12 mph (20 km/h),
• a steep gradient is detected,
• wheel behavior indicates loose ground or conditions with poor
adhesion (e.g. also axle articulat ion).
Hill descent control operates both dr iving forward and in reverse.
Active hi ll descent control is deactivated by pressing the accelerator
pedal until the conditions for activation already listed are met aga in.
& WARNING
• The Electronic Stabilization Program is nevertheless subject to
the laws of physics . It is particularly important to pay attention to
this fact on wet and slippery roads. It is therefore important that
you always adapt your driving to the condition of the road and
traffic conditions. Do not allow the increased safety provided by
the Electronic Stabilization Program system to lull you into
accepting additional safety risks. ..
Vehicle care Do-it-yourself service Technical data

_________________________________________ I_ n_ t_ e_ ll_,igent technology ,__E~-
If an individual wheel begins to rotate too slowly in relation to vehicle
speed and tends to lock, the ABS automatically reduces brake pres­
sure to prevent that wheel from locking .
Thi s automatic adjustment process wi ll cause a
slight vibration of
the brake pedal and some noises to alert you that vehicle speed must
be adapted to existing road and traffic conditions.
_& WARNING
Although the ABS is very effective, always remember that braking
capability is limited by tire traction. Always adjust your driving
speed according to the road and traffic conditions. Do not let the
extra safety afforded by the ABS tempt you into taking extra risks.
The ABS cannot overcome the laws of physics .
(I) Tips
• If ABS is not funct ioning properly, a warning light will come on .
See ~
page 19.
• If a fault occurs in the ABS, the EDL is also not functioning. This is
ind icat ed by the ABS warning light. •
Brake assistant
The brake assistant is designed to achieve the optimum
braking effect.
The brake assistant helps to increase the effective braking power and
thus to achieve a shorter stopping distance.
If the driver presses the
brake peda l very qu ickly , the brake assistant automatically boosts the
braking force to the maximum level, up to the point where the anti­
lock brake function (ABS) intervenes to stop the whee ls from locking.
You should then keep the brake pedal pressed until the vehicle has
braked to the required speed. The brake assistant switches itself off
as soon as you release the brake pedal.
Controls and equip­ ment Safety first Vehicle operation
Automatic full braking
assist
This function allows full braking in spite of high brake pedal forces
(e .g . when the brakes are severely stressed because the veh icle is fully
loaded). The driver notices this function through a reduction of pedal
force and increased pedal travel. When the brake pedal is released,
full braking assist switches off again automatically.
If there is an ABS failure, the brak e assistant and automatic full
braking assist are not available.
Th e brake assistant will not be operative if there is a ma lfunction in
the ABS .
_& WARNING
Please remember that the accident risk always increases if you
drive too fast, especially in corners or on a slippery road, or if you
follow the vehicle ahead of you too closely. Increased risk of an
accident cannot be compensated for even by the brake assistant ,
so always maintain a safe speed.•
Servotronic® -advanced power
steering system
The power steering systems uses the power of the
running engine to allow precise steering with little effort.
The advanced Servotronic ® power steering system senses the road
speed and electronically adjusts power assistance to provide
comfortable and safe steering response exactly matched to the
vehicle speed .
Power steering will not work if the engine is off. As a result , the
steering wheel will be hard to turn .
Th e power steering fluid level is checked during the scheduled main­
tenance services.
Vehicle care Do-it-yourself service Technical data

-Tires and wheels PR:1-------------------
the 22nd week of 2010. The other numbers are marketing codes that
may or may not be use d b y the ti re manu facture r. T his in format ion is
used to contact consumers if a tire de fect requires a recall.
Audi Original tire
T ires with the ident ificat ion "AO" or "RO" have been specially
m atche d w ith your Audi. We recommend using on ly these t ire s
because t hey meet the hig hest standards regard ing safety a nd
dr iving charac teris tics when used corre ctly. Your aut horize d Aud i
dea ler w ill glad ly provide you wi th mor e informatio n.
Tire ply composition and materials used
T he number of p lies indicates the number of layers of rubber-coated
f abr ic in the tire. In ge ne ral, the greate r the numbe r of p lies, the
more weig ht a tire ca n support. Tire manufac turers also mus t indi­
c ate the materials in the t ire, which incl ude stee l, nylon, polyes ter,
and others .
Maximum Load Rating
This number ind icates the maximum load in k ilograms and pounds
t ha t can be carried by the tire .
Tire quality grading for treadwear, traction, and
temperature resistance
Tread wear, traction and temperat ure grades~ page 333.
Maximum Permissible Inflation Pressure
Th is number is the greatest amount o f air press ure t hat should eve r
be pu t in the tire under no rm al driv in g c ond ition s.
& WARNING
• Using incorrect or unmatched tires and/ or wheels or improper
tire and wheel combinations can lead to loss of control , collis ion
and seriou s personal injury.
& WARNING (co ntinued )
• Always use tires, rims and wheel bolts that meet the specifica­
tions of original factory-installed tires or other combinations that have been specifically app roved by the vehicle manufacturer.
• Tires age even if they are not being used and can fail suddenly,
especially at high speeds . Tires that a re more than 6 years old can
only be used in an emergency and then with special care and at
lower speeds.
• Never mount used tires on your vehicle if you are not sure of
their "previous history ." Old used tires may have been damaged
eventhoughthedamagecannotbeseenthatcanleadtosudden
tire failure and loss of vehicle control.
• All four wheels must be fitted with radial tires of the same
type , size (rolling circumference) and the same tread pattern.
Driving with different tires reduces vehicle 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
tire for a short period of time and drive with extra care . Refit the
no rmal road wheel as soon as safely possible .
• Never drive faster than the maximum speed for which the tires
on your vehicle are rated because tires that are driven faster than
their rated speed can fail suddenly .
• Ove rloading tire s cause heat build-up, sudden tire failure,
including a blowout and sudden deflation and loss of control.
• Temperature grades apply to tires that are properly inflated
and not over or underinflated.
• For technical rea sons it is not always possible to use wheels
from other vehicles- in some cases not even wheels from the same
vehicle model.
• If you install wheel trim discs on the veh icle wheels, make sure
that the air flow to the brakes is not blocked . Reduced airflow to
the brakes can them to overheat , increasing stopp ing distances
and causing a colli sion.
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lffll,.___T_ ir_e_ s _ a_ n _ d_ w_ h_e_ e_ ls _______________________________________________ _
in. WARNING
The traction grade assigned to this tire is based on straight-ahead
braking traction test s, and d oes not include acceleration ,
cornering, hydroplaning or peak tra ction chara cteristics .
in. WARNING
The temperature grade fo r this tire is established for a tire that is
properly inflated and not overloaded. Ex cessive speed, underinfla ­
tion, or excessive load ing, either separately or in comb inat ion, can
c ause heat buildup and po ssible tire failure. •
Winter tires
Winter tires can improve v ehicl e handling on snow and
ice . At temper atures below 45 °F (7 °C) we recommend
ch anging to w inter tires.
In some heavy snow areas, loca l governme nts may requ ire true
w inter o r "snow" tires, those with very deep ly c ut trea d. These tires
sho uld only be used in pa irs and be installed on all four whee ls. Make
sure you p urchase snow tires that are the same size and construct ion
type as the ot her t ires on your ve hicle.
Your vehicle is equipped with a ll-wheel drive, th is will improve trac­
tion dur ing wi nter dr iv ing, even w it h the standar d tires. Howeve r, we
strong ly recommend that you always eq uip a ll four wheels on yo ur
veh icle with correctly fitte d winter t ires or all-season ti res, when
w inte r road conditio ns are exp ect ed. This also imp roves th e veh icle's
bra king perfo rmance an d red uces stopping distances.
S um mer tir es p rovide le ss grip on ice and snow .
Winter tires (snow tires) m ust always be fitted on all four wheels.
Ask your aut horized Audi dealer or q ualified workshop for permitted
winter tire sizes . Use only ra dial w inter tires. W
inter tires lose the ir effectiveness when the tread is wor n down to
a dep th o f 0. 157 inch ( 4 mm).
On ly drive w ith w inter t ires under w inter cond it io ns. S umme r tires
han dle better when the re is no snow or ice on the roads and the
tempe ra ture is a bove 45 °F (7 °C).
If you have a flat tire, see notes on spare wheel=>
page 330.
Please always remember that winter tires may have a lower speed
rat ing than the tires originally installed on yo ur veh icle at t he time it
was man ufact ured . Please see=>
page 331, "Speed rating (letter
c ode)" for a list ing of t he speed ra ting le tte r c odes and the maxi mum
speed at which the tires can be driven .
Th e spee d rat ing let ter code (=>
page 3 21) is on the side w all of the
tire=>
page 330.
in. WARNING
Winter tires have maximum speed limits that may be lower than
your vehicle 's maximum speed . Always know the maximum speed
before dr iving off. Never drive faster than the speed permitted for
your specifi c winter tires . This will caus e damage to the tires
lead ing to an accident and serious personal injury to you and your
pa ssengers.
in. WARNING
Driving fa ster than the maximum speed for whi ch the winter tires
on your vehicle were designed can cause t ire failure including a
blowout and sudden deflation , lo ss of control , crash es and seriou s
personal injuries. Have worn or damaged tires replaced immedi­
ately.
• Winter tires have maximum speed rating that may be lower
than your vehicle's maximum speed .
• Never drive faster than the speed for which the winter or other
tires installed on your vehicle are rated.
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