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Operating conditions and dr iving habits
The brakes on today 's au tomobiles a re still s ub
ject to wea r, depend ing la rgely on ope rating con
ditions and driving habits¢.&. . On vehicles that
ar e e ither driv en most ly in stop-and -go city traf
f ic or are driven ha rd, the brake pads should be
checked by your authorized Aud i dealer more of
ten than specified in the
Warranty & Mainte
n ance boo klet .
Failure to have your brake pads
inspected can resu lt in reduced brake perform
ance.
On steep slopes, you should use the braking ef
fect of the eng ine . This way, you prevent unnec
essary wear on the brake system . If you must use
your b rakes , do not ho ld the brakes down con tin
uously. Pump t he b rakes at intervals.
Operating noise
Noises may occur when braking depend ing on the
speed , braking force and outs ide cond itions such
as tempe rature and humidity .
Effect of water and road sa lt
In certain situations, for example a fter driving
t hrough water, in heavy ra in , after overnight con
densat ion or after washing your car, the braking
effect can be reduced by moisture or ice on the
b rake rotors and b rake pads . T he brakes must be
d ried first w ith a few careful b rake applica tions.
At highe r speeds and with the windsh ie ld w ipers
turned on, the bra ke pads press aga inst the brake
rotors for a short amount of time . Thi s occ urs at
r egular intervals wit hout the d river noticing and
p rovides for be tter br ak e response time u nder
wet conditions.
The eff ectiv eness of the brakes can be reduced
when the vehi cle is dr iven on a salt-covered road
and the brakes are not used. L ikewise, you clean
off acc umu la ted salt coat ing from b rake discs
and pads with a few ca utious applications of the
b rake ¢.&. .
Corrosion
There may be a tende ncy for d irt to b uild up on
the brake pads an d cor ros io n t o fo rm on the discs
if the ca r is not driven regular ly or only fo r sho rt
trips with little use of the brakes .
Intelligent Technology
If
the brakes are not used frequent ly, or i f co rro
sio n 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 shou ld notice a sudden inc rease in brake
peda l travel, t hen one of t he two brake circ uits
may have fai led ¢
&..
Low brake fluid level
Malfunctions ca n occur i n the b rake system if the
br ak e fluid level is too low . T he brake f lu id leve l
is moni tored elect ronically .
Brake booster
The brake booster increases the press ure that
yo u generate with the b rake peda l.
It only oper
ates while the eng ine is r unning or w it h t he igni
tio n sw itched on (hybr id drive*) ¢.&, .
Brake lining wear status
Brake lining wear may be chec ked by visual in
spect io n of t he condition of the brake pads
t hr ough the openings in the wheel.
If necessary,
t h e wheel may be removed fo r th is i nspe ction
¢ page 259, Replacing wheels .
.&_ WARNING
--
-New brake pads don't have the bes t stop
p ing power an d m ust be " broken-in" d uring
the initial 250 miles (400 km). You can compensate for this by pressing the brake
pedal more firmly. This also applies later
when new pads are insta lled.
- You sho uld perform braking maneuvers for
the purpose of cleaning t he brake system
only if road condit io n s pe rmit . O ther road
users m ust not be put at r is k - you may
cause an accident!
- Before descending a steep g rade, reduce
speed and sh ift transmission into a lower
gea r or l ower dr iv ing ra nge. Do not r ide the
b rakes or hold the ped al down too long or
too often. This co uld cause t he b rakes to ge t
hot and dimi nish braking eff ic ien cy .
- Do no t "ride the br akes" by res ting you r foot
on the pedal when you do no t intend to ...,
193
