brake light AUDI Q2 2021 Owner´s Manual

Driver assist systems

CO

< o rN
iv
rN
•-i

00
- In certain situations, the system may misin­
terpret driving manoeuvres and inappropri­
ately recommend a break.
- No acute warning is given if the driver falls
into a microsleep.
Instrument cluster display
Applies to: vehicles with rest recommendation

H
Rest recommended
If the warning lamp lights up and the message
appears, the evaluation of the steering input has
resulted in a rest recommendation. This is also
indicated by a warning tone. Take a break as soon
as possible.
The message may be displayed again once if nec­
essary.
Switching on/off
Applies to: vehicles with rest recommendation
Select the following on the infotainment system:

|MENU|
button > Car > left control button > Driv­
er assist > Rest recommendation.
© Note
If you switch off the system,
it
will remain
switched off the next time you switch on the

ignition.

Audi adaptive cruise
control
Description
Applies to: vehicles with Audi adaptive cruise control

»

Fig.
100 Sensor range
The adaptive cruise control is a combined speed
and distance control system. It assists the driver
by controlling the road speed and the distance to
the vehicle in front within certain limits imposed
by the system. The adaptive cruise control sys­
tem can accelerate and brake when it detects a
vehicle in front. This provides maximum comfort
both on long motorway journeys and in conges­
ted traffic (automatic gearbox*).
What can the adaptive cruise control do?
The adaptive cruise control uses a radar. The ra­
dar is subject to certain system limitations

opage
112.
When there is no traffic in front, the adaptive
cruise control works just like a normal cruise
con­

trol system by maintaining a constant speed.
When you draw closer to a vehicLe in front which
is detected by the system, the adaptive cruise
control matches your speed to that vehicle by au­
tomatically applying the brakes, and then main­
tains a constant distance (which you can adjust in
the settings). As soon as it detects no more
vehicles in front, the adaptive cruise control ac­
celerates back up to the cruising speed.
Applies to: vehicles with automatic gearbox
In congested traffic, the adaptive cruise control
can brake down to a standstill and accelerate
again (subject to general system limitations) un­
der certain conditions
*$page
115, Driving in
congested traffic. The traffic jam assist (active
lane assist)* can assist the driver in traffic jams
and heavy congestion
<=>page
117.
Which functions can the driver control?
When you switch on the adaptive cruise control,
you can set your current speed as the "cruising

speed"
^>page
113, Switching
on/off.

While you are driving, you can interrupt the
cruise control
opage
115 or change the speed
setting
Opage
114 at any time.
In addition, you can adjust the distance to
vehicles in front and the driving program for the
adaptive cruise control
^>page
116.

Ill

Driver assist systems

CO

<
O
rN rN
t-H
o <

•
To increase or reduce the speed quickly, hold
the lever towards
©/©
until the
LED ©
opage
113, Fig. 105 reaches the de­
sired cruising speed.
You can preselect the speed, even when the
adaptive cruise control is inactive, by moving the
lever in the appropriate direction ©/©. To
acti­

vate the preselected speed, pull the lever to
posi­

tion ©
^>page
113, Fig. 104.
Following any changes, the new stored speed will
be displayed briefly in the status line

opage
113, Fig. 105 ©. The indicator lamp
E53
KOI
is also lit when the adaptive cruise control is

active,
and the indicator Lamp
B3 iS Lit
when the
adaptive cruise control is inactive. The indicator

lamp El
will Light up instead in the Audi virtual
cockpit*.
Driving in congested traffic
Applies to: vehicles with Audi adaptive cruise control and au­
tomatic gearbox
The adaptive cruise control assists you when driv­
ing in congested traffic. If
a
vehicLe which has
been detected in front stops, the adaptive cruise
control applies the brakes (within the limits im­
posed by the system) and holds the vehicle at a

standstill.

•
To set the vehicle in motion again with the
adaptive cruise control, tap the accelerator

with
your foot, or

•
Pull the lever towards you to position ©

•=>
page 115, Fig. 107.
Using the adaptive cruise control to set the
vehicle in
motion1'

If the message ACC: ready to drive off is on the
display and the vehicle in front drives off, your
vehicle will automatically start moving
•=>
A. You
can reactivate the ACC: ready to drive off mes­
sage briefly by pulling the lever to position ©.
For safety reasons, your vehicle will start moving
only if
- the driver's seat belt is
buckled.

x)
Not available on vehicles for some markets.
- all the doors and the bonnet are closed,
- your vehicle has been stationary for Less than
3 minutes.

A
WARNING
If the ACC: ready to drive
offx)
message ap­

pears,
your vehicle will start moving even if
there is an obstacle between your car and the
vehicle in front - risk of accident!
© Note
If your vehicle does not start moving as ex­
pected with the adaptive cruise control, even
though the ACC: ready to drive
off1)
message
is displayed, you can set the vehicle in motion
by tapping the accelerator with your foot.
Interrupting the cruise control
Applies to: vehicles with Audi adaptive cruise control

Fig.
107 Control lever
Important: The adaptive cruise control must be

on.

Overriding the cruise control

•
To accelerate manually, pull the lever towards
you to position © and hold it in this position or
press the accelerator. The message ACC: over­
ride will appear.
• To reactivate the cruise control, release the Lev­
er or take your foot off the accelerator.
Interrupting the cruise control while driving

•
Move the lever to position ©. The message

ACC:
standby will appear. Or:
• Apply the brakes.
115

Driver assist systems
© Note
The distance may be below the warning
threshold for a short time when overtaking or
approaching a slower vehicle quickly from be­

hind.
In this case, no warning will be given. A
warning is only given if the distance is consis­
tently below the threshold.
Driver messages
Applies to: vehicles with Audi adaptive cruise control

El
ACC:
not available
The system cannot detect vehicles reliably and
will be deactivated. The sensor is out of align­
ment or defective. Drive to a qualified workshop
and have the fault rectified.

EH
ACC:
currently unavailable. No sensor vision

Eo3
ACC:
currently unavailable. Sensor view re­
stricted due to surroundings. See owner's
man­

ual
These messages appear if the radar sensor vision
is impaired, e.g. by leaves, snow, heavy road
spray or dirt. Clean the sensor
^>page
112,
Fig. 101.

E3
ACC:
currently unavailable. Speed too low
Manual gearbox: This message appears if the cur­
rent speed is too low for
ACC
mode. You cannot
store speed settings below 30 km/h. The cruise
control system switches off if the speed falls
be­

low 20 km/h.

Esi
ACC:
available from 2nd gear up
Manual gearbox: The adaptive cruise control only
operates in 2nd gear or higher.

B
ACC:
currently unavailable. Gradient too
steep
The maximum possible road gradient for safe op­
eration of the adaptive cruise control has been

exceeded.
The adaptive cruise control cannot be
switched on.
ffl
Ea3
ACC:
only
available in D, S or M < o

PI
Automatic gearbox: Move the selector lever to

g
position D/S or M. <
00

Eol
ACC:
clutch pedal pressed
Automatic gearbox: Cruise control mode is deac­
tivated if the clutch pedal is pressed for
a
rela­
tively long period.

Bf
ACC:
engine speed
Manual gearbox: This message appears if the
driver does not change gear in time when the
adaptive cruise control accelerates or brakes the
vehicle and the engine speed is too high or low as
a result. The adaptive cruise control is switched

off.

EJACC:
parking brake applied
The adaptive cruise control system is deactivated
if the parking brake is applied. The adaptive
cruise control will be available again when the
parking brake is released.

Eo3
ACC:
currently unavailable. Stabilisation
control input
This message appears if the electronic stabilisa­
tion control (ESC) intervenes. In this case, the
adaptive cruise control will automatically be
switched off.

Eo3 ACC
off: manual control!
This message appears if the vehicLe rolls back­
wards when driving away on a slight gradient,
even though the adaptive cruise control is active.
Press the brake pedal to prevent the vehicle from
rolling back or colliding with an object behind.

EM
ACC:
currently unavailable. Park assist ac­
tive
The systems are switched off when the park as­
sist* is active. The systems will be available again
when the parking manoeuvre is finished.
Distance warning: fault. Please contact work­
shop
The system cannot detect vehicles reliably and
will be deactivated. The radar sensor is out of
alignment or defective. Drive to a qualified work­
shop and have the fault rectified.
Distance warning: currently unavailable. Sensor
view restricted due to surroundings •
119

Driver assist systems
This message appears if the radar sensor vision is

impaired,
e.g. by leaves, snow, heavy road spray
or dirt. Clean the sensor
<^>page
112, Fig. 101.
Distance warning: currently unavailable. See
owner's manual
This driver message will appear if the system
fails temporarily. If the fault occurs repeatedly,
drive to a qualified workshop and have the fauLt

rectified.

Fasten seat belt
The system is not fully available when the driver's
seat belt is unfastened.
Stationary object ahead
This message appears if
you
try to switch on the
system when a stationary object is located imme­
diately in front of your car.
Door open
The system is not available when the vehicle is
stationary and the driver's door is open.
Audi pre sense
Introduction
Applies to: vehicles with Audi pre sense
The pre sense functions can take action to pro­
tect the vehicle occupants and other road users in
certain hazardous conditions within the system

limits.

- Because the different on-board systems are

networked,
pre sense basic can detect critical
situations and take preventive action to protect
the occupants.
- The pre sense front uses the data of the radar
sensor to calculate the probability of an
acci­

dent
opage
112. It can detect an impending
collision with vehicles or
pedestrians1^
(subject
to general system limitations). In this case, the
system warns the driver visually, acoustically

and,
if necessary, with a short, sharp brake ap­

plication.
If necessary, it can initiate a partial or

fuLl
brake application in order to reduce the im­
pact speed or, in certain circumstances, to
avoid a collision. In conjunction with pre sense
basic, the reversible tensioners on the front
seat belts are also applied if necessary. Pre
sense front is active even when the adaptive
cruise control* is switched off.
Please observe the general safety warnings

•=>
A in General notes on page 112.
© Note
- Certain pre sense functions are deactivated
when reversing.
- The functions of the pre sense system may
also be unavailable if
a
fault develops in the

ESC
system or airbag control unit.
- Please note that, if the front passenger's
airbag has been deactivated, the reversible
belt tensioner on the passenger's side will
be deactivated as
well.

- Switch off pre sense on private roads and
while the vehicle is being loaded onto a car
transporter, train or ferry, etc. This prevents
the pre sense system from taking action in
an inappropriate situation.
Audi pre sense basic
Description
Applies to: vehicles with Audi pre sense basic
The pre sense basic functions are activated at
speeds above approximately 30 km/h.
The system can activate the following functions
in certain situations:
- Seat belt tensioning (e.g. during hard braking):
The seat belts on the front seats have reversi­
ble tensioners. Provided an accident does not
occur, the belts are loosened again slightly and
kept ready for activation.
- Initiation of the closure process for the
win­

dows and panorama sun roof* (e.g. if the
vehi­

cLe understeers or oversteers).
Audi drive select*: the activation threshold
dif­

fers according to the mode selected.

x)
Not available on vehicles for some markets.
120

Driver assist systems
provided tempt you into taking any risks when
driving - this can cause accidents.
- Please note that pre sense front can give
warnings or apply the brakes unexpectedly.
Always secure your luggage to prevent dam­
age and possible injury.
- Due to inherent system limitations, false ac­
tivation of the system is possible.
- Please note that the sensor is not always
able to detect all objects which may repre­
sent a potential hazard - risk of accident!
- Pre sense front does not react to the follow­

ing:
oncoming traffic in the same lane, sta­
tionary or stopped persons, pedestrians
crossing the road at an angle, groups of
people, animals, or objects that are hard to

recognise •=>
A in General notes on
page 112.
A WARNING
The pre sense front functions may be restric­
ted or unavailable in situations such as the

following:

- If objects such as crash barriers or other
vehicles are reflecting additional light.
- At tunnel entrances.
- In heavy fog,
rain,
road spray or snow.
- If the radar sensor is dirty, frosted, dam­
aged or covered.
- When driving through a corner.
-Applies to: front-wheel drive vehicles: If the
ESC system has been partially or fully deac­

tivated.

© CAUTION
Impacts or damage to the bumper, wheel
arches or underbody can cause misalignment
of the sensor. This can impair the function of
the pre sense front system. Have the systems
checked by a
quaLified
workshop.
© Note
-The automatic brake application with in­
creasing brake force can be cancelled by ap­
plying the brakes yourself or by pressing the
accelerator firmly or by taking evasive ac­

tion.

- Applies to: front-wheel drive vehicles: Cer­
tain pre sense front functions are deactiva­
ted when the ESC
offroad
mode is switched
on and when reversing.
- Applies to: front-wheel drive vehicles: The
pre sense is deactivated if you restrict or
switch off the ESC
^>page
146.
Settings on the infotainment system
Applies to: vehicles with Audi pre sense front/Audi adaptive
cruise control

•
Select the following on the infotainment sys­

tem:
|MENU|
button > Car > left control button
> Driver assist > Audi pre sense.
System - The pre sense functions can be switched
on/off.
Advance
warning15
- You can switch the advance
warning off or set the warning time for pre sense
front (early/medium/late).
Start by setting the advance warning to early. If
you then find that the system warns you earlier
than desired, you can set the advance warning to

medium.
The advance warning should be set to
late only in exceptional cases, such as during very
dynamic driving.
If a system or the advance warning function is
switched off, it will be automatically activated
again the next time you switch on the
ignition15.

Driver messages
Applies to: vehicles with Audi pre sense
Audi pre sense: fault. Please contact work­
shop
This message appears if the functions of the pre
sense system are impaired. An impairment can
occur, for example, if a sensor fails. If the mes­
sage remains displayed permanently, drive to a
qualified workshop soon and have the fault
recti­

fied.
•

x)
Not available on vehicles for some markets.
122

Driver assist systems

CO

< o
rN
r>
rN
t-H
o < 00
- On vehicles for some export markets: once
the system is activated, it is "ready" each
time the ignition is switched on.
Instrument cluster display
Applies to: vehicles with Audi active lane assist
Drive to a qualified workshop soon and have the
fault rectified.

Fig.
116 Instrument cluster: active Lane assist switched
on and ready to warn
You can use the controls on the multi-function
steering wheel to call up the active lane assist
display
^>page 15/^>page
18.
Information is also provided in the head-up dis­
play*.
Instrument cluster
display
Green line(s)
(left or right)
Red Line
(left or right)
Grey line(s)
(left or right)
Meaning on correspond­
ing side
The active lane assist is
switched on and ready to

warn.

The active lane assist
warns you before you
cross the lane demarca­

tion.
In addition, the
steering wheel vibrates
slightly.
The active lane assist is
switched on but not ready
to warn.
Driver messages in the instrument cluster
display
Should the active lane assist be deactivated auto­
matically, the indicator lamp on the display will
go out and one of the following messages will
appear:
Audi active lane assist: system fault!
Audi active lane assist: currently unavaila­

ble.
No camera view
This message is displayed when the camera is no
longer functional after the system has continu­
ously failed to detect the lane markings. This can
have the following causes:
-The outside of the camera window
^page
124,
Fig. 115 is dirty or frosted. Remove dirt or ice
from this area of the windscreen.
- The inside of the camera window is misted up.
In this case, wait for the camera window to de­
mist before switching on the active lane assist
system again.
- Due to the road conditions, the system has not
been able to detect the lane markings for a
long period. Do not switch the active Lane assist
system on again before the lane markings are
discernible.

Q
Audi active lane assist: currently unavailable
A temporary fault is preventing the active lane
assist system from functioning. Try switching on
the active lane assist system again later.

|
Audi active lane assist: please take over

steering.

This message will appear if
you
do not steer the
vehicle yourself. The active lane assist is switched
on but not ready to warn. If the driver still does
not react, the system warns additionally with a
short sharp application of the brakes and
acti­

vates the emergency assist*
^>page
126.
A WARNING
Please note that the messages only appear
with a delay or are not displayed at all on
vehicles with additional equipment (such as
steering wheel knobs) fitted on the steering

wheel.
Always keep your hands on the steer­
ing wheel.
125

Driver assist systems
Setting the steering input time and
vibration warning
Applies to: vehicles with Audi active lane assist

You
can change the Audi active lane assist
set­

tings on the infotainment system to
suit
your in­
dividual preferences.

•
Select the following on the infotainment sys­

tem:
|MENU|
button > Car
>
left control button
> Driver assist
>
Audi active lane assist.
Steering
input1'

early: If this setting is selected, a continuous
steering input assists the driver to keep the
vehi­

cle in the middle of the lane.

late:
If this setting is selected, the steering is not
corrected until just before a wheel crosses a de­
tected Lane marking.
Vibration warning
You can switch the additional steering wheel vi­
bration warning on/off.
A WARNING
When the vibration warning is switched off,
no visual warnings are given in the instrument
cluster display if
you
cross a lane marking.
Your personal settings are stored automati­
cally and assigned to the remote control key
which is being used
W.

Emergency assist
Applies to: vehicles with emergency assist
The emergency assist takes over controL of the
vehicle in certain situations and can help to pre­
vent accidents. It is an extension of the active
lane assist and can use the functions of the adap­
tive cruise control system
<=>^.
The emergency
assist is activated when it detects that the driver
has stopped steering the vehicle.
Functions of the emergency assist
The emergency assist monitors the steering ac­
tivity of the driver. It detects if the driver is inac­
tive and gives repeated visual and audible warn­
ings as well as brake jolts prompting the driver to
take proactive control of the vehicle again. The
hazard warning lights are also switched on when
the first sharp brake jolt is given below
a
speed of
80
km/h15.

If the driver does not take over, the system inter­
venes by steering the vehicle (within the limita­
tions of the system) to keep it in lane, and by ap­
plying the brakes until the vehicle has stopped*.
In addition, the warning lamp || and a message
are displayed.
Requirements for using the emergency assist
- The active lane assist must be switched on and
ready to warn
^>page
124.
-The adaptive cruise controL must be switched
on and activated
^>page
113.
If any of the requirements for the active lane as­
sist
^>page
123 or adaptive cruise control

tapage
112 are not met, the functionality of the
system may be restricted or it may be deactiva­
ted automatically.
Interrupting the emergency assist
You can interrupt the emergency assist if it reacts
when it shouldn't
•=> A:

- Move the steering wheel. Or:
- Press the brake/accelerator. Or:
- Switch off the active lane assist via the button

<>
page 117, Fig. 110.
WARNING
- As the driver you are always responsible for
controlling the vehicle. Do not let the emer­
gency assist tempt you into taking any risks
when driving - this can cause accidents.

l)
This function is not available on all export versions.
126

Driver assist systems

CO

< o rN
r>
rN
t-H
o < 00
-The automatic brake application with in­
creasing brake force can be cancelled by ap­
plying the brakes yourself or by pressing the
accelerator firmly.
- In certain situations, a warning may be giv­
en by the rear cross-traffic assist even if
there is no traffic in the critical zone, for in­
stance when parking or manoeuvring the ve­
hicle in reverse.
- The rear cross-traffic assist is deactivated
automatically if you deactivate the
ESC.

-The rear cross-traffic assist is switched on/
off via the parking aid
^>page
134.
-The system is not available in towing mode.
Driver messages
Applies to: vehicles with Audi side assist
Should the side assist be deactivated automati­
cally, a driver message will appear in the instru­
ment cluster display.

O
Audi side assist: system fault!
The system cannot detect vehicles reliably and
will be deactivated. The sensors are out of align­
ment or defective. Have the system checked by a
qualified workshop soon.

O
Audi side assist: currently unavailable. No
sensor vision

O
Audi side assist: currently unavailable.
Sen­

sor view restricted due to surroundings. See
owner's manual
The radar sensors are blocked. The area in front
of the sensors must not be obstructed by bicycle

racks,
stickers, deposits or any other substances.
If necessary, clean the area in front of the
sen­

sors
^>page
128, Fig. 120.

O
Audi side assist: currently unavailable
The side assist is temporarily inoperative and
cannot be switched on (for instance if the battery
is not sufficiently charged).

O
Audi side assist: unavailable in towing mode

2
Audi side assist: unavailable in towing mode
The side assist function will be switched off auto­
matically after a short time when the electrical
connector for the trailer socket is plugged in on
vehicles with a factory-fitted towing bracket. If
the towing bracket is not factory-fitted the side
assist function may not be switched off automat­
ically. The side assist must not be used when
towing a trailer.

O Rear
parking aid: obstacle detection limited
The rear cross-traffic assist is not available. Ei­
ther the ESC is switched off or the radar sensors
may be obstructed by a bicycle rack, stickers,
leaves, snow or similar objects. Switch on the ESC
or, if necessary, clean the area in front of the
sen­

sors
<3page
128, Fig. 120. If this message re­
mains displayed, drive to a qualified workshop
soon and have the fault rectified.
Audi drive select
Introduction
Applies to: vehicles with Audi drive select
Audi drive select alLows you to use different set­
ups on your vehicle. The modes efficiency*, com­
fort, auto and dynamic allow the driver, for ex­

ample,
to change from a sporty mode to a more
comfortable one via the
&&
button in the centre
console or via the infotainment system. In
addi­

tion,
the individual* mode allows you to adapt
the vehicle set-up to
suit
your personal driving

style.
For example, you might choose to combine
a more dynamic engine set-up with a lighter
steering response.
Description
Applies to: vehicles with Audi drive select
The possible vehicle set-up in each mode de­
pends on which equipment is installed on your
vehicle. The engine and steering are basic parts
of your vehicle which are always included in the

set-up.

Engine and automatic gearbox*
The response of the engine and automatic
gear­

box* to accelerator pedal movements will be
more spontaneous or balanced, depending on
131

Parking aids

comes
closer than before, the tone will sound

again.
If the tone is muted and the obstacLe is
further away than before, no tone will sound.
Please watch the area surrounding the vehicle
when driving off.
©
Zone
(§)*
is detected and analysed as the
vehi­

cLe is moving past. When you switch the
igni­

tion off and on again or open the door, or af­
ter the vehicle has been stationary for
a
while,
the ambient surroundings may have changed.
Zone
0*
is displayed in black on the infotain­
ment display for this reason.
Switching on/off
Applies to: vehicles with parking system plus/park assist

Fig.
125 Centre console: Button for parking aid

^H i m
1 •rif/^^^y^H <

12|
1 )
'.•;"

•BiHiSi
-

Fig.
126 Infotainment display: Proximity graphic
Switching on

•
Engage reverse gear, or

•
Press the
P»i
button in the centre console

^>Fig.
125. You will hear
a
brief acknowledge­
ment tone and the LED in the button will light

up-

Switching
off

• Drive forwards faster than 10 km/h, or

*•
Press the
?">k
button, or

•
Switch off the ignition.
Automatic activation
The parking aid is activated automatically when
the vehicLe approaches an obstacLe from a dis­
tance of approx. 95 cm at speeds below 10 km/h.
You will hear the warning beeps when the obsta­
cle is within a distance of approx. 50 cm. If the
parking aid is switched off by pressing the
P*A

button,
it is only reactivated automatically if one
of the following conditions has been met:
- The vehicle is driven faster than 10 km/h.
- The ignition is switched off and on again.
-The parking brake is applied and released

again.

- The selector lever is in position P (automatic
gearbox).
Segments in the graphic display
You can estimate the distance to an obstacle by
referring to the segments in front of and behind
the vehicLe or the segments surrounding the ve­
hicle (on
vehicLes
with park assist*)
^>Fig.
126.
The red lines* indicate the anticipated path of the
vehicle, depending on the steering wheel angle.
A white segment indicates an obstacle that has
been detected beyond the path of
travel.
Red
segments represent objects detected within the
path of
travel.
The closer the vehicle gets to the
obstacLe the closer the segments move towards
the vehicLe in the graphic. At the Latest when the
penultimate segment is highlighted the vehicle
has reached the danger (collision) zone. Obsta­
cles within the danger (collision) zone are shown
in red, even if
they
are beyond the path of travel.
Stop moving immediately
•=>
A in General notes
on page 134,
•=>©
in General notes on page 134
136

Intelligent technology

/r\
WARNING
You should switch on the off-road mode or
switch off the ESC/traction control system
(ASR) only if your driving ability and the traf­
fic conditions allow you to do so safely -
dan­

ger of skidding!
- The stabilising function is restricted when
off-road mode is switched on. The driven
wheels may start to
spin,
causing the
vehi­

cle to lose grip, in particular on slippery or
wet roads.
- When the ESC/traction control system
(ASR) is switched off, the vehicle will not be

stabilised.

Brakes
New brake pads
New brake pads do not give full braking effect for
the first 400 km, they must first be "bedded in".
However, you can compensate for the slightly re­
duced braking effect by applying more pressure
on the brake pedal. Avoid placing a heavy load on
the brakes during the running-in period.
Wear
The rate of wear on the brake pads depends a
great deal on how you drive and the conditions in
which the vehicLe is operated. Negative factors

are,
for instance, city traffic, frequent short trips
or hard driving with abrupt starts and stops.
Noises
Brake noise may develop in certain situations, de­
pending on the speed, braking force and ambient
conditions (such as temperature and relative hu­
midity).
Effect of moisture and salt
In certain conditions, such as in heavy
rain,
early
morning dew, or after washing the car or driving
through water, the full braking effect can be de­
layed by moisture (or in winter by ice) on the
discs and brake pads. The brakes should be
< "dried" by pressing the pedal to restore full brak-

R
ing effect.
When you are driving at higher speeds with the
windscreen wipers on, the brake pads are very
briefly brought into contact with the brake discs.
This automatic process which goes unnoticed by
the driver is carried out at regular intervals and is
intended to improve braking response in wet
con­

ditions.
The effectiveness of the brakes can also be
tem­

porarily reduced if the car is driven for some dis­
tance without using the brakes when there is a
lot of salt on the road in winter. The layer of salt
that accumulates on the discs and pads can be
removed with a few cautious brake applications.
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 used infrequently, or if
you
only drive
low mileages without using the brakes very

much.

If the brakes are not used frequently, or if corro­
sion 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
•=> A-

Faults in the brake system
If the brake pedal travel should ever increase
suddenly, this may mean that one of the two
brake circuits has failed. Drive immediately to the
nearest qualified workshop and have the fault

rectified.
On the way to the dealer, be prepared
to use more pressure on the brake pedal and al­
low for longer stopping distances.
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.
Brake servo
The brake servo amplifies the pressure you apply
to the brake pedal. It only works when the engine
is running. •
147