2008 AUDI A4 AVANT water pump

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• when driving in deep snow or on a loose surface (to allow the
wheels to dig in to reach firm ground)
• when trying to "rock" the vehicle free when it has become stuck .
The system should be reactivated once you are no longer in such
situations.
Both, the ABS and EDL systems are still functioning even if the ESP
is switched off.
& 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 305, "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.
Controls and equip­ ment Safety first Vehicle operation
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.
Moisture or road salt
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 cautious 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. Likewise,
you clean off accumulated salt coating from brake discs and pads
with a few cautious 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

llffl.___l_n _t _e _ll _ig =- e_n _ t_ te_ c_h _n_ o_ lo-'g'"'-=- y ___________________________________________ _
&, WARNING (continued )
• Before des cending a steep grade , reduce speed and shift trans­
mi ssion into a lo wer gear or lower driving po sition . Do not ride the
brake s or hold the pedal down too long or too often . This could
cau se the brake s to get hot and dimini sh braking efficiency .
• Do not ride the brakes by resting your foot on the ped al when
you do not intend to brake. This may cause the brakes to overheat, premature wear and in creased stopping distan ce.
• Under certain climati c and operating conditions such a s
passing through water, driving in heavy rain or after washing the
v ehicle , the effectiveness of the brakes can be reduced . In winter ,
ice can a ccumulate on the brake pads , linings , discs and drums .
Cautiously apply brakes for a te st. Brakes will dry and ice coating s
will be cleaned off after a few cautious brake applicat ions .
• Driving for an extended period of time on salt-co vered roads
without using your brakes can also affect braking effi ciency . Clean
off accumulated salt coating from brake discs and pads with a few
c autious brake appli cations .
• If you damage the front spoiler , 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 brake 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 .•
Brake booster
T he brake booster add s ex tra braking power.
The bra ke booster works wit h vacuum pressure which is created
only whe n th e e ng in e is
runn ing=> &,.
& WARNING
• Never let the vehi cle roll to a stop with the engine shut off .
• If the brake booster 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)
A BS preven ts th e wh eels fr om lock ing up und er b rak ing.
T he ABS contributes effectively to vehicle contro l since it prevents
th e w heels from
lo cki ng w he n t he brakes a re a ppli ed. T h is mea ns
that the vehicle remains steerable and is less likely to skid.
With ABS you do not need to pump the brake . Just hold the brake
pedal down .
However, do not expect that the ABS shortens braking distance
u nder all circum sta nces. Whe n driving o n gravel or on newly fa lle n
snow on top of icy surfaces, braking distance may be even longer,
t herefore, under these ci rcums tances, it is espec ial ly i mpo rtant th at
you driv e slowly 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 . Wh en th is happe ns, a pumpi ng noi se can be hea rd.
I f a n indiv idual wheel be gins to rotat e too slowly i n relation to
vehic le speed and tends to lock, the ABS automatical ly reduces
brake pressur e to prevent tha t whee l from loc king .
Th is a utomatic adjustment process wi ll cause a
slight vibration of
t he brake peda l a nd s om e noi ses t o a lert y ou th at ve hicle spee d
must be adapted to existing road and traffic conditions. _..

11111.___F_ u_ s_ e_s _ a_ n_d _ b_u_ l_ b _ s ______________________________________________ _
No.
37
38
39
40
41
43
44
Equipm ent
Pump for windshie ld and headlight washer *
system
Central elect ric, anti -theft a larm system, rear
lid/ tr u nk release
Rad io
Horn
Auxiliary hea tin g
Electronic Stab ilization P rogram (ESP)
Engine timing
Seat heating
Automatic circuit bre akers : Amps
30
15
20
25
30
25
15
35
T he electric power windows and the electr ic seat adjusters are
pro tected with circu it breakers which reset automatica lly after the
circuit overload has been corrected .
[ i ] Tip s
• Whenever replacing a fuse, always consult the sticker on the
inside of the fuse panel cover . It contains the most up -to -date info r­
mat ion regarding the fuse arrangement . If in doubt , ask your autho ­
rized Audi Service adv isor .
• Some of the equipment items listed are op tiona l o r only avail ­
able on certa in model configu rations .•
Bulbs
A pplies to vehicle s: wit h xenon he ad ligh ts
Replacing light bulbs
For your safety, we recommend that you have your autho ­
rized Audi dealer replace any bulbs for you.
I t is becoming increasing ly more and more difficult t o replace
vehic le light bulbs since in many cases, other parts of the car must
first be removed before yo u are able to get to the bu lb . T his applies
especia lly to the ligh t bu lbs in the front of your car which you can
only reach th rough the eng ine compartment.
Sheet metal and bulb ho lders can have sharp edges that can cause
s e rious cuts, and parts must be correctly taken apart and th en prop­
erly put back together to help prevent breakage of par ts and long
te rm damage from water that can enter housings that have not
been properly resealed .
For your safety , we recommend that you have your authorized Audi
dea ler replace any bulbs for you, since your dealer has the prope r
tools, the correct bulbs and the expertise .
Gas di sc harge l amp s (x enon l ight s)*:
Due to the h igh e lectrical voltage, have t he bu lbs replaced by a qual ­
ified technician . Head lights with xenon light are identified by the
high voltage sticker .
& WARNING
Changing xenon lamps without the ne cessary equipment c an
c au se seriou s per sonal injury .
• Bulb s are pres surized and can explode when being changed.
Potential ri sk of injur y!
• On vehicle s equipped with ga s di scharge bulb s (xenon ligh t)*
life -threaten ing injurie s can re sult from impr oper h andling of the
high -voltage portion s of su ch lamp s!
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