2012 AUDI Q7 brake sensor

The Audi braking guard is active from a speed
of approx. 20 mph (30 km/h) and works with­
in the system limits
¢ page 125 even when
the adaptive cruise contro l is deact ivated.
A radar senso r is bui lt into the front of the ve­
hicle
¢ page 114, fig. 127. The system is in­
tended to measure the distance to reflect ive
surfaces. If a measurement is not possible,
the system does not respond .
When the measurement has been taken, the
system can recognize a poss ibly hazardous sit ­
uation, for example, when a vehicle up ahead
in your lane of travel suddenly brakes or when
your ow n ve hicle is moving at high speed to­
wards a much s lowe r vehicle up ahead . As
soon as the system senses that a possible co l­
l ision with the vehicle up ahead can only be
avoided by immediate full brake appl ication or
by an avoidance maneuver, a warning appears .
The system has a defau lt response time to be
ab le to sig na l befo re a col lision occu rs. This
system response time is a utomat ica lly re­
d uced if you acce lerate actively, for example
to join a highway. Braking, transverse acce ler­
ation and the steering ang le can lead to a re­
duced system response time. The warning is
deactivated if you begin to overtake with full
acceleration.
The system can make yo u aware of two differ­
ent hazardo us situations:
Distance
The distance warn ing is g iven if the sys tem
calc ulates that the re is not enough d istance
to the vehicle up ahead a period of more than 5 seconds. If the distance is less than 30 feet
(9 meters) at SO mph (80 km/h), for example,
an optical d isplay comes on in the instrument
cluster
c> fig . 146.
If the vehicle ahead brakes sharply, A udi brak­
ing guard cannot help you to avoid a co llision,
even in the case of an immediate response.
Take immediate act ion to avoid the collision
and increase the distance to the vehicle up
ahead .
Adapti ve crui se control 127
Speed
If there is a much slowe r vehicle mov ing up
ahead in your lane, or if the vehicle ahead brakes sharply, the Audi brak ing guard calcu­
lates the point from which a collision can only
be avoided by f ull braking or by an avo idance
maneuver . If a warning does sound, a possible
collision with the veh icle in front can only be
avo ided through an evas ive maneuver or by
braking.
The warning is given in two stages:
- Pre-warnin g: A visua l display appears in the
instrument cluster and a warning tone
sounds.
- Acute w arning : If you do not respond to the
pre-warning, the second stage warning is
given. A quick brake application helps to di­
rect your attention to the road and traffic
situat ion.
Under heavy braking, the brake assistant
i=> page 114 also helps you benefit from maxi­
mum brak ing eff ic iency.
_& WARNING
Inattention can cause collisions, other ac­
cidents and ser ious personal inju ries.
- Always pay close attent ion to the traffic,
even when the Audi braking guard is
sw itched on. The Audi braking guard pro­
vides a wa rning but does not brake the
car for you. You must app ly the brakes
yourse lf!
- Always keep the safe and lega l distance
between yo ur vehicle and vehicles up
ahead.
- Aud i brak ing g uard wor ks within lim its
and will no t respond outside the system
limits, fo r example when approach ing a
stopped vehicle or stationary obstacle (end of a traffic jam or vehicle that has
broken down in traffic).
- Always remember that the radar sensor
for the Audi braking guard works within
defined detect ion and range limits that
may prevent the proper detection of oth­
er vehicles .

Intelligent technology Notice about data
recorded by vehicle
control modules
Your vehicle is not equipped with an Event Da­
ta Recorder (EDR), installed by some manu­
facturers for the express purpose of capturing
data for retrieval after an accident or crash
event. EDRs are sometimes called "crash re­
corders".
Some state laws restrict the retr ieval or down­
loading of data stored by EDRs that were in­
stalled in a vehicle for the express purpose of
retrieving data after an accident or crash
event without the owner's consent.
Although your vehicle is not equipped with an
EDR, it is equipped with a number of electron­
ic control modules for various vehicle systems
such as, for example, engine function, emis­
sion control, as well as for the airbags and
safety belts.
These electronic control modules also record
vehicle-related data during norma l vehicle op­
eration for diagnostic and repair purposes.
The recording capacity of the electronic con­
trol modules is limited to data (no sound is re­
corded) and only a small amount of data is ac­
tually recorded over a very limited period of
time and stored when a system fault or other
condition is sensed by a control unit. Some of
the data then stored may relate to vehicle
speed, direction, braking as we ll as restraint
system use and performance in the event of a
crash or other condition. Stored data can only be read and downloaded with special equip­
ment.
Intelligent technology 219
Electronic Stability
Control (ESC)
General information
The ESC improves the vehicle stability.
. ..---------..
------- -
Fig. 218 Center console with ESC sw itch
ESC is designed to help you maintain vehicle
control in situations where the car approaches
the limits of "grip", especially when accelerat­
ing and cornering. ESC reduces the risk of
skidding and improves stability under all road
condit ions .
The system operates across the entire speed range in combination with the ABS system. If
the Anti-Lock Brake System (ABS) malfunc­
tions, the ESC will also shut down.
How the system works
The Anti-Lock Brake System (ABS), Electronic
Differential Lock (EDL) and the Anti-Slip Regu­
lation System (ASR) are integrated in the Elec­
tronic Stability Control. In addition to the da­
ta provided by these functions, the ESC con­
trol unit requires additional measurement da­
ta provided by high performance sensors. The
rotational speed of the vehicle about its verti­
cal axis, vehicle acceleration in the fore-and­
aft and lateral directions, the brake pressure and the steering angle are all measured.
T he direction in wh ich the driver wishes to
travel is determined with the aid of the steer­
ing angle and vehicle speed and is continually
compared with the actua l behavior of the ve­
hicle. If the two do not match, for example,
when the vehicle starts hydroplaning on a wet
road, ESC will automatically brake the appro-
priate wheel to correct the problem. ..,_
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Electronic differential lock (EDL)
The electronic differential lock monitors the
rotational speed of the drive wheels.
G ener al note s
The electronic differentia l lock (EDL) helps the
car to start mov ing, accelerate and climb a
gradient on surfaces providing poor or almost
no gr ip . W ithout EDL, this would be difficult,
if not impossible .
How the s yst em work s
The EDL operates automatically . It monitors
the rotat ional speed of wheels w ith the help
of the ABS sensors <=>
page 223. If a noticea­
ble
slip i s detected at the wheels (e.g . on slip­
pery ground
on one side), the spinning wheels
are braked and power is transferred to the
other wheels. This is done up to a speed of
about 60 mph (100 km/h). Noises from the b rake system signal that wheel spin is being
contro lled .
Driving off
When driv ing off , a lways be sure to keep road
conditions in mind as you accelerate . If one
drive whee l spins because it is on a surface
with less grip, apply
plenty of throttle until
the car starts to move.
Overheating of brakes
To prevent the disc brake of the b raked wheel
from ove rheating if subjected to excessive
l oads on this whee l, the EDL cuts out tempo ­
ra rily. The vehicle remains operational and be­
h aves in the same way as a vehicle without
EDL.
As soon as the brake has cooled down, EDL
switches on again automatically .
A WARNING
-When accelerating on slippery surfaces,
such as on ice or snow, always be careful
when depressing the acce lerator pedal.
Even with the EDL working, the drive
wheels can spin and reduce your ability
to control your car . R isk of crash!
Int ellig ent technolog y 221
-The increased safety afforded by EDL
does not mean that you can take safety
risks. Always adapt your driving style to
the road condit ions and traffic situation .
(!) Tips
If a fault occurs in the ABS, the EDL is also
not functioning. This is ind icated by the
ABS warning light <=>
page 18.
' Anti-Slip Regulation System (ASR)
The Anti-Slip Regulation System prevents the
driven wheels from spinning when the car is
accelerating.
G eneral not es
The Anti-Slip Regulation System (ASR) is inte­
grated in the Electronic Stability Control
(ESC). When the vehicle starts up and acceler­
ates, the wheels are prevented from spinning
by adjust ing the eng ine power to match the
amount of grip available from the road sur ­
face .
How the system works
ASR performs automatica lly, i.e. without the
driver 's intervention. With the aid of the ABS
sensors <=>
page 223, ASR monitors the speed
of the dr iven wheels. If the wheels start to
spin, engine torque is reduced automatically
unt il the t ires find enough grip to lock onto
the road surface. The system is active across
the enti re speed range.
The ASR works in conjunction with the ABS. If
a malfunction should occur in the ABS, the
ASR wi ll also be ou t of act ion.
A WARNING
The increased safety affo rded by ASR does
not mean that you can take sa fety risks.
A lways adapt your driving sty le to the road
conditions and traffic situation. ...,
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Engine Compartment .... ..... ... ... ... ...
260
Coolant .. .. .... ........ ... .. .. .. . 265
Hood .. .. .. ...... ........... .. ... 258
Starting . . . . . . . . . . . . . . . . . . . . 105 , 106
Starting with jumper cables .. ... .... 308
Stopping ... ... .. ... ... .. .. .. .. .. . 106
Engin e compartm ent
Safety instructions ... ..... .. .. .. .. .
258
Working the engine compar tmen t ... . 258
Engine coolant system ... ... .. .. .. .. . 265
Adding coolant . .. ..... ... .. .. .. ... 267
Checking coolant leve l .. ... .. .. .. .. . 266
Checking the eng ine coolant leve l .. .. . 266
M alfunct ion .. ........... .. .. .. .. .. 32
Radiator fan .............. ... ... .. 268
Engine coolant temperature
Temperature ga ug e .... ... .. .. .. .. ..
10
Eng ine data .. .. ........... .. .. .. .. . 3 16
Eng ine hood
C losing ...................... ....
258
H ow to release the hood . .. .. .. .. .. . 258
Engine oil . .. ............. .... .. .. . 260
Adding .. .. ........ ..... .... .. .. . 264
Addi tives . .. ............. .... .. .. . 264
Changing .................. .... .. 264
Checking the eng ine o il level .. .. .. .. . 263
Consumpt ion ................. .... 262
Indications and cond it ions requ iring ex-
tra checking ............. .... .. ...
263
O il grades .. ... .. ..... ... .. .. .. ... 260
Recommended oil check intervals .. .. . 263
Specification and viscosity . ... .. .. .. . 260
Eng ine oi l level ..... ..... .. .... .. .. .. 36
Eng ine oil pressure
Malfunct io n ... .. ... ... .. .. .. .. .. ..
33
Eng ine oil sensor defective . ... .. .. .. .. 36
E ng ine speed limitat io n ..... .. .. .. .. .. 36
Entry assist
Rear seats . . . . . . . . . . . . . . . . . . . . . . . . . 7 5
Environment Break-in period . .. ..... ... .. .. .. ...
228
Catalytic converter ........ .. .. .. .. . 229
Diesel particulate filter .... .. .. .. .. . 229
Disposing of your vehicle battery .. .. . 273
Driving at h igh speeds ......... ... .. 230
D riving to m inimize pollution and no ise 230
Inde x 329
Fuel . ... .. .. .... .. . .. .. ..... ... .. 253
Fuel economy .. .... . ... ...... ... .. 230
Leaks unde r your vehicle ..... ... .. .. 258
Letting the vehicle stand and warm up . 230
Proper disposal of dra ined brake fluid . 269
P roper disposal of drained eng ine cool -
ant .. .. .. .. .. .. .. . .. ... ... .. ....
267
Proper disposal of d ra in ed eng ine oi l .. 264
Recycling used eng ine oil . ....... .... 2 64
Un leaded fuel .. .. .... .... ....... .. 2 50
Wha t shou ld I do with an o ld battery? . 273
EPC
refer to Elect ron ic power control ...... 15
ESC
refer to E lectron ic Stability Control ( ESC) 16
Event Da ta Recorde r (ED R) ..... ... .. .. 219
Exhaust tail pipes
Cleaning .. .. .. .. .. . ... ...... ... ..
244
Expansion tank .. .. ................. 266
Explanation of some technical te rms ... 232
Ex terior lighting in the mirror housing 59
Exterior m irrors
Adjusting . . . . . . . . . . . . . . . . . . . . . . . . .
68
Dimming .. .. .. .. .. ............... . 69
Heating ... .. .. .. .... ....... .... ...
68
Eyeglasses compartment . ..... ... .. .. . 89
F
Fa ll line
Fan Fou r-zo ne automatic comfo rt air condi-232
t 1o ni ng ... .. .. .. .. . .. .......... .. . 98
Radiator .. .. .. .. .. . ... ........... 2 68
Fasten ing
Booster seats .. ... ...... ......... .
208
Convertible child safety seats ... ... .. 206
Infant seats . .. .. .. ........... .... 205
Flat tire
Changi ng ... .. .. .................
298
Floor mats . ... .. .... . ... ...... ... .. 165
Fog lights .. .. .. .... .......... ...... 58
Fo lding chocks .. .. ............. .... 295
Fo ld ing master key wi th remo te control . . 38
Foot pedals . .. .. .... .......... ..... 165
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