2013 AUDI Q7 water pump

228 Intelligent technology
To ensure that the ASR works properly, all
four wheels must be fitted with identical
tires. Any differences in rolling rad ius of
the t ires can cause the system to reduce
engine power when this is not desired. See
also¢
page 291, New tires and replacing
tires and wheels.
Braking
General information
What affects braking efficiency?
Operating conditions and driving habits
The brakes on today's automob iles are st ill
subject to wea r, depending la rgely on operat­
ing cond itions and dr iv ing habits
Q ,& . On
vehicles that are either driven mostly in stop­
and -go city traffic or are driven hard, the
brake pads should be checked by your author­
ized Audi dealer more often than specified in
the
Warranty & Maintenance booklet . Failure
to have your brake pads inspected can result
in reduced brake performance .
On steep slopes, you shou ld use the braking
effect of the engine. This way, you prevent un­
necessary wear on the brake system. If you
must use your brakes, do not hold the brakes
down continuously . Pump the brakes at inter­
va ls.
Noises may occur when braking depending on
the speed, braking force and outside condi­
tions such as temperature and humidity.
Moisture or road salt
Under certain conditions, for examp le, 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 o r remove any ice coatings.
When you are driving at higher speeds with
the w indshield wipers on, the brake pads will
brief ly touch the brake discs in regular inter- vals so as
to improve reaction time when brak ­
ing on wet surfaces . You, the driver, will not
notice anything.
T he effect iveness of the brakes can be reduced
when the vehicle is driven on a sa lt-covered
road and the brakes are not used . Here too,
you should clean off accumulated sa lt coating
from brake discs and pads w ith 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 regu larly or
only for short trips with litt le use of the
brakes.
If the brakes are not used frequently, or if cor­
rosion 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
c> ,& .
Faults in the brake system
If you shou ld notice a sudden increase in
brake pedal trave l, then one of the two brake
c ir cuits may have fa iled
c> ,& .
Low brake fluid level
Malfunctions can occur in the brake system if
the brake fluid level is too low. The brake fluid
l evel is monitored electronically .
Brake lining wear status
Brake lining wear may be checked by visual in­
spect ion of the condition of the brake pads
through the openings in the wheel. If neces­
sary, the wheel may be removed for this in­
spect ion
c> page 304, Changing a wheel.
A WARNING
-- You shou ld perform braking maneuvers
for the purpose of cleaning the brake
system only if road conditions permit.
Othe r road users must not be put at risk -
you may cause an accident!

@ Tips
- When the engine is running, never hold
the steer ing whee l turned a ll the way to
the right or t o the left f or longer than 15
seconds. The power steering pump w ill
overheat the hydraulic f lu id if you keep
hol ding the steer ing wheel turned all the
way. This is likely to damage the power
steering system.
- If the power steer ing system should fail
ent irely, or if the engine is not running
(fo r example, while being towed), you
will still be ab le to steer the vehicle.
However,
considerably more effort will
be required to do so.
- If the power s teer ing system should
have a leak, or is not functioning proper­
l y, contact yo ur authorized Audi dealer
immediately.
- The power stee ring system requires a
spec ially formulated hydraulic fluid. The
power steering reservo ir is the one locat­
ed farthest to the rear on the left side of
the engine compartment
c> page 266.
The co rrect flu id level in the reservoir is
i mportant for proper functioning of the
power steer ing .
Driving with your
quattro ®
With all-wheel drive, oil four wheels ore driv ­
en.
Gener al information
W ith all -whee l dr ive , power is distributed to
a ll fo ur wheels. This happens automatica lly
depending on yo ur driving sty le and the road
conditions at the time . See also
¢ page 227,
Electronic differential lock (EDL) .
Winter tires
When driving in the w inter, your ve hicl e w it h
all -wheel drive has an advan tage, even with
regu lar tires . In winter road conditions it may
be advisable to mount winter tires (or all -sea­
son t ires) for improved driveability and brak-
Int ellig ent technolog y 231
ing: these tires must be mounted on all four
wheel s. See also ¢
page 295, Winter tires .
Tire chains
Where tire chains are mandatory o n certain
roads, this no rma lly also app lies to veh icles
with all-wheel drive¢
page 296, Snow
chains.
Replacing wheels /tires
Vehicles with all-wheel drive must always have ti res of t he same s ize. A lso avo id tires
with different t read depths. For det ails see
page
c!;> page 291, New tires and replacing
tires and wheels .
_& WARNING
A lways adj ust yo ur driv ing to road and traf­
f ic conditions. Do not let the extra safety
afforded by all-wheel drive tempt you into
taking extra risks.
-Altho ugh the all-wheel drive is very ef­
fective, always remember that braking
capacity is lim ited by tire traction. You
should therefore not drive at excessive
speeds on icy or slippe ry road surfaces .
- On wet road surfaces, be careful not to drive too fast because the front wheels
could begin to slide o n top of the water
(aquaplaning). If th is should occur, yo u
will have no warning from a s udden in­
crease in engine speed as w ith a front ­
wheel drive vehicle. Always drive at
speeds which are suited to the road con­
ditions -risk of crash.
Energy management
Starting ability is optimized
Energy management controls the distribution
of electrical energy and thus optimizes the
availability of electrical energy for starting the engine.
If a vehicle with a conventiona l energy system
is not driven for a long per iod of t ime, the bat­
te ry is discharged by idling cur rent consume rs
(e.g. immobi liz e r). In certa in circumstan ces it ..,_
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