2010 AUDI A5 CABRIOLET brake sensor

Intelligent technology
--------------------------------------------------' "---.L==--
The system operates across the entire speed range in combination
with the ABS system. If the Anti-Lock Brake System (ABS) malfunc­
tions, the ESP will also shut down.
How the system works
The Anti-Lock Brake System (ABS), Electronic Differential Lock (EDL)
and the Anti-Slip Regulation System (ASR) are integ rated in the elec­
tronic stabilization program . In addition to the data provided by
these functions, the ESP control unit requires additional measure­
ment data provided by high performance sensors . The rotational
speed of the vehicle about its vertical axis, vehicle acceleration in the
fore-and-aft and lateral directions, the brake pressure, and the
steering angle are all measured .
Th e direction in which the driver wishes to travel is determined with
the aid of the steering angle and vehicle speed and is con tinually
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 stabilized by the forces acting on the whee l during
brak ing.
If the vehicle is oversteering (the vehicle turns too sharply
and the rear wheels slide toward the outside of a curve), the brakes
are mainly applied on the wheel that is on the outside of the curve. In
the case of a vehicle that is
understeering (the vehicle does not turn
sharply enough and pushes out of a 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 signal indicates when ESP brake
application cuts in=> &.
The system operates across the entire speed range in combination
with the ABS system =>
page 245. If the Anti- Lock Brake System
(ABS) malfunctions, the ESP will be out of action as well.
Activating
When you turn on the engine, ESP will automatically be activated and
w ill perform a self-test. As soon as the test is comp leted, the system
is in normal operating mode.
Controls and equip­
ment Safety first Vehicle operation
You can activate a
deactivated ESP or deactivated ESP/ ASR if required
by pressing the =>
page 240, fig. 214 => page 240, fig. 213 button.
When they are activated, the message
ESP/ ASR on appears briefly
in the display.
Deactivating
The ESP should normally be activated all the time. If necessary, you
can deactivate Anti-Slip Regulation (ASR) or the Electron ic Stabiliza ­
tion Program (ESP) by press ing the button =>
page 240, fig. 214 .
• Deactivating ASR: Tap the button . In certain exceptional s itua­
t ions (e.g. driving with tire chains), the Anti-Slip Regu lation (ASR) can
be deact ivated =>
page 242. The message ASR off appears in the
display as we ll.
• Deactivating ESP/ASR Press the button for more than 3 seconds .
With the ESP/ASR deactivated, the ESP check light comes on, see
=>
page 14. The message ESP switched off appea rs in the display as
well.
& 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.
u
Vehicle care Do-it-yourself service Technical data

Intelligent t echnology
---------------------------------------
Electronic differential lock (EDL)
The elec tronic differen tial lock monitors the rotational
speed of the drive wheels.
G en era l not es
The electronic differentia l lock (EDL) helps the ca r to sta rt moving,
accelerate and climb a gradient on surfaces provid ing poor or almost
no grip . W ithout ED L, this would be d iff icu lt, if not impossible.
How the sy stem works
The EDL operates automatically. It mo nitors the rota tional speed of
wheels with the help of the ABS sensors=>
page 245. If a not iceab le
slip is detected at the wheels (e.g. on slippery g round on one side),
the spinn ing 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).
No ises from the brake system signal that wheel sp in is being
controlled.
Driv ing off
When d riving off, always be s ure to keep road conditions in mind as
you accelerate. If one drive wheel spins because it is on a surface with
less grip, apply
plenty of throttle until the car starts to move.
O verheating of bra kes
To prevent the disc b rake of the bra ked wheel from ove rhea ting if
subjected to excessive loads on this wheel, the EDL cuts out tempo­
ra rily. The vehicle remains operat io nal and be haves in the same way
as a veh icle without EDL.
As soon as the brake has coo led down, EDL switches on again auto ­
matically.
Electronic limited slip differential
In vehicles w ith front wheel drive *, an e lectron ic lim ited slip d ifferen­
tial engages when driving on curves . The brakes are applied spec ifi­
cally to the front wheel that is on the inside of the curve. T his m ini­
m izes sliding on the front wheels and enables precise and neutral dr
iv ing t hrouge curves. The electronic lim ited slip differentia l does
no t engage whe n driving in we t cond it io ns or snow.
& WARNING
• Wh en acc elerating on slipp ery s urface s, such a s on ice or snow,
always be careful when depre ssing the accele rator pedal. Even
with the EDL and the electroni c limited slip differential working,
the dr ive wh eels can spin and reduce you r ability to control your
c ar . -Ri sk of cra sh!
• The increased safet y afforded b y EDL and the electronic l imited
slip differ ential d oes not mean th at you can take safety risks .
Alw ay s adapt your d riving st yle to the road c onditions and traffi c
si tuation.
[ i ] Tips
If a fa ult occurs in the ABS, the EDL is also not funct ioning. This is
ind icated by the ABS warn ing light=>
page 16 . •
Anti-Slip Regulation System (ASR)
The Anti-Slip Regulation System prevents the driven
wheels from spinning when the car is a ccelerating.
General notes
T he Anti-Slip Regu lation System (ASR) is in tegrated in the electronic
stabilization program (ESP) . When the veh icle starts up and acceler­
a tes, the wheels are preven ted from sp inning by adjust ing the engine
power to match the amount of grip ava ilable from the road surface.
How the system works
ASR performs automatica lly, i.e. without the driver's intervent ion.
With the a id o f the ABS sensors=>
page 245, ASR moni tors the speed
of the driven wheels. If the wheels start to spin, engine torque is
reduced automatically unti l the tires find enough grip to lock onto
the road s urface. The system is active across the entire speed range . .,

-Alphabetical inde x lffi'f ___,__ ______________ _
Emergency release
Selector lever ............ ... .. ..
154
Emergency starting .. ..... .......... 333
Emergency towing ..... ............. 336
Eme rgency unlocking
Ignition key .. .. .. .. ...... ........
39
Energy management ................ 247
Battery power ................ ... 249
Driver notification ............. ... 249
Engine
Compartment . ...... .... .... .. ..
281
Coolant ............ .... .. .... .. 286
Hood . ............. .... ...... .. 279
Starting ..................... ... 106
Starting with jumper cables ..... ... 333
Stopping . ...................... 107
Engine compartment
Safety instructions ............ ...
280
Working the engine compartment .. 280
Engine coolant system
Malfunction .......... ...... .. ....
29
Radiator fan ........ .... .. .. .. .. 289
Engine coolant temperature
Temperature gauge ............ .. .. 8
Engine cooling system ............ ...
286
Adding coolant ... ............... 288
Checking coo lant level . .. ....... .. 287
Checking the engine coolant level . .. 287
Engine data ...... .......... ...... .. 342
Engine hood
Closing .................. .... ...
280
How to release the hood .. ....... .. 279
Engine oil . ..... ....... ... .. .. .. ... 282
Add ing ....... ... .. .. .. .. ....... 285
Additives .. ..... ... .. .. ......... 285
Changing .. .... .. .... .. .. .. .. .. . 285
Check o il level ...... .... .. .. .. .. . 284
Consumption . .. .. .. .. .... .. ..... 284
Oil consumption .......... .. .. .. . 283
Oil grades .... ................ .. 282
Specification and viscosity ... ... .. . 282
Engine oil level ................... ... 35
Engine oil pressure
Malfunction ... ................. ..
30
Engine oil sensor defective ............ 35
Engine speed limitation ............... 35
Environment
Break-in period ............ ..... .
250
Catalytic converter ........ .. .. .. . 251
Disposing of your vehicle battery . .. .
294
Driving at high speeds ..... ...... . 253
Driving to minimize pollution and noise ..
252
Fuel ........................... 276
Fuel economy ................... 252
Leaks under your vehicle .......... . 280
Letting the vehicle stand and warm up ...
253
Proper disposal of d rained brake fluid 290
Proper disposal of drained engine coo lant
288
Proper disposal of d rained engine oil 285
Recycl ing used engine o il .. . .. .. .. . 285
Unleaded fuel ............ .. .... . 274
What should I do with an old battery?
294
Environmental note
Rear window defogger ........ .
92, 100
EPC
See Electronic power control . . . . . . . . 13
ESP
See Electronic stabilization program (ESP)
240
Event Data Recorder (EDR) 240
Exhaust ta il pipes
Cleaning ........... ...... .... ..
267
Expansion tank .. .. .. .. ............. 287
F
Fan .................. .. .... .... 91,98
Radiator . ........... ...... .... .. 289
Fastening
Booster seats ............ .... . ..
230
Convertible child safety seats ...... 228
Infant seats .. .. ................ . 227
Flat tire
Changing .......................
320
Floor mats ..... ...... .. . .. .. .. .. .. 183
Fog lights .................. ..... ... 63
Folding the rear seat backrests .. ...... . 84
Foot pedals . ........... ...... .... .. 182
For the sake of the environment
Gasoline fumes and the environment
276
Refueling ................ ... .. .. 276
Saving fuel by early upshifting ........ 9
Front airbags Description .. ...... .............
204
How they work ...... .. .... .. .. .. 209