water pump AUDI S6 2008 Owners Manual

& WARNING (continued)
extreme caution when working under the hood => page 289,
"Engine compartment".
[ i ) Tips
Many functions are monitored by the Auto -Check system
=>
page 30. Malfunctions or faults wil l be identified either with a red
symbo l (pr ior ity 1 -Danger!) or with a yellow symbol (priority 2 -
Warning). •
Electronic power control r
This warning/indicator light monitors the electronic
power control.
The warning/indicator light (E lectronic Power Control) illumi -
nates when you turn on the ignition as a function check.
[ i ) Tips
If this warning/indicator light illuminates while you are driving, then
there is a malfunction in the engine electronics . Have the malfunc ­
tion corrected as soon as possible by your authorized Audi dealer or
qualified repair faci lity .•
Generator 0
This warning/indicator light detects a malfunction in the
generator or in the vehicle's electrical system.
The d warning/indicator light illuminates when you switch on the
ign ition and mus t go out after the engine has started .
If the
d warning/indicator light illuminates while you are driving,
you shou ld contact your authorized Audi dealer. Since the vehicle
Controls and equip ­
ment
Instruments and warning /indi cator lights
battery is discharging, you shou ld switch off any unnecessary elec ­
trical consumers (for examp le, the air conditioner).
0 Note
If the _f_ warning/indicator light (malfunction in the engine coo ling
system) in the instrument cluster shou ld illuminate=>
page 33, stop
the vehicle and turn off the engine . The water pump is not work ing
- this can cause engine damage. •
Electronic stabilization program (ESP)
This warning/indicator light monitors the electronic stabi ­
lization program.
The warning/indicator light has the following functions:
• I t blinks while you are driving when the ESP is working.
• It illuminates when you switch on the ignition for approximately
2 seconds as a function check.
• It il luminates when there is a malfunction in the ESP.
• It illuminates when ESP or ASR (Anti-S lip Regulation) is deacti­
vated .
• It illuminates if there is a malfunction in the ABS, since the ESP
is part of the ABS system.
If the battery terminals were disconnected and re-connected, the
vehicle was jump started or the battery is
very weak, the ESP sensor
system goes through a learning process for the first few yards. The
warning/indicator light i lluminates . The warning/indicator light
goes out as soon as the learning process is complete.
If the ESP warning/indicator light illuminates and stays on after you
have started the engine, this may mean that the control system has
te mporarily switched off the ESP. If this is case, you can reactivate
the ESP by turning the ignition off and then on again . The
warning/indicator light should go out to show that the system is
fully functional again.
~
I • •

When the abnormal situation is over, you should activate the ASR
again.
& WARNING
The increased safety afforded by ASR does not mean that you can
take safety risks. Always adapt your driving style to the road
conditions and traffic situation.
[ i] Tips
To ensure that the ASR works properly, all four wheels must be fitted
with identical tires. Any differences in rolling radius of the tires can
cause the system to reduce engine power when this is not desired.
See also~
page 325, "New tires and replacing tires and wheels". •
Braking
General information
What affects braking efficiency?
Operating conditions and driving habits
The brakes on today's automobiles are still subject to wear,
depending largely on operating conditions and driving habits~& .
On vehicles which are driven mostly in stop-and-go city traffic or
which are driven hard, the brake pads should be checked by your
authorized Audi dealer more often than specified in the
Mainte­
nance
& Warranty booklet.
On steep slopes, you should use the braking effect of the engine.
This way, you prevent unnecessary wear on the brake system. If you
must use your brakes, do not hold the brakes down continuously.
Pump the brakes at intervals.
Controls and equip­
ment Safety first Vehicle operation
Intelligent technology
Moisture or road salt
If
you are driving faster than 50 mph (80 km/h) and the windshield
wipers are on, the brake pads will briefly touch the brake discs in regular intervals so as to improve reaction time when braking on
wet surfaces. You, the driver, will not notice anything.
Under certain conditions, for example, when driving through water
or very heavy rain, or even after washing your vehicle, the braking
effect can be reduced due to moisture (or in freezing conditions ice)
on the brake pads. A few careful brake applications should dry off
the brake pads or remove any ice coatings .
The effectiveness of the brakes can be reduced when the vehicle is driven on a salt-covered road and the brakes are not used. Here too,
you should clean off accumulated salt coating from brake discs and
pads with a few careful applications of the brake ~& .
Corrosion
There may be a tendency for dirt to build up on the brake pads and
corrosion to form on the discs if the car is not driven regularly or
only for short trips with little use of the brakes.
If the brakes are not used frequently, or if corrosion has formed on
the discs, it is advisable to clean off the pads and discs by braking
firmly a few times from a moderately high speed~&.
Faults in the brake system
If you should notice a sudden increase in brake pedal travel, then
one of the two brake circuits may have failed~& .
Low brake fluid level
Malfunctions can occur in the brake system if the brake fluid level is
too low . The brake fluid level is monitored electronically .
& WARNING
• You should perform braking maneuvers for the purpose of
cleaning the brake system only if road conditions permit. Other
road users must not be put at risk -you may cause an accident!
Vehicle care Do-it-yourself service Technical data

___ ln_ t _e_ ll-'"ig ...,_ e_ n_t _t_ e_ c_ h _ n_o _ l_o _,.g= y,_ __________________________________________ _
& WARN ING (continued )
• Before des cending a steep grade , reduce speed and shift trans­
mission into a lower gear or lower dr iving range. D o not r ide the
brakes or hold the pedal down too long or too often . This could
c au se the brake s to get hot and dimin ish braking effi ciency.
• Do not "ride the brakes " by resting your foot on the pedal when
you do not intend to b rake. This may cause the brakes to overheat ,
premature wear and in crea sed stopping distan ce.
• Under certain climat ic and oper ating condit ion s s uch as
passing through water, driving in heavy rain or after washing the
vehicle , the effectiveness of the brakes can be reduced. In winter ,
ice c an a ccumulate on the brake pads , linings , discs and drums .
Carefully apply brakes fo r a test. Brakes will dry and ice coatings
will be cleaned off after a few careful brake applications .
• Driving for an e xtended pe riod of time on salt-covered road s
without using your brakes can also affect braking efficiency . Clean
off accumulated salt coating from brake disc s and pads with a few
careful brake applications .
• If you damage the front spoile r, or if you install a different
spoiler , be sure the air flow to the front brakes is not obstructed .
Otherwise the brake system could overheat reducing the effective ­
ness of the entire br ake system .
• Failure of one brake circuit will impair the braking capability
resulting in an increased stopping distance . Avo id driving the
vehicle and have it towed to the nearest Audi dealer or qualified
workshop .
u
Brake booster
T he brake boo ster ad ds e xtra bra kin g pow er.
T he brake booster works with vacuum pressure which is created
only when t he en gine is run ning~ &.
& WARNING
• Never let the vehi cle roll to a stop with the engine shut off .
• If the brake boo ster is not working, for example 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 . •
Functioning of Anti-Lock Brake System (ABS)
-- --
ABS preven ts the wheels from l ocking up und er bra kin g.
T he ABS contributes effectively to vehicle contro l since it prevents
th e w hee ls fr om lo cking when the brakes a re app lied . T hi s m ea ns
that the vehicle remains steerable and is less l ikely to skid.
With ABS you do not need to pump the brake . Just hold the brake
pedal down .
H owever, do not expect the AB S to shorten braking distance under
all circu ms tances. When drivi ng on grave l or on newly fa lle n sn ow
on top of icy surfaces, braking distance may be even longer, there ­
f o re, unde r these c ircums ta nces , it is es pecially imp ortant th at you
drive slow ly and with great care .
How the ABS system works
An automatic check is made when a speed of about 4 mph (6 km/h)
i s r eac hed . W he n th is happens, a pumping n oise ca n be heard.
I f a n indiv idual wheel be gins to rotat e too slowly in relation to
vehic le speed and tends to lock, the ABS automatically reduces
brake pressur e to p revent that whee l from loc king .
T his automatic adjustment p rocess will cause a slight vibration of
t he brake peda l a nd some noi ses t o a le rt yo u th at ve hicle speed
must be adapted to ex isting road and traffic conditions. .,