AUDI A5 2008 8T / 1.G Owners Manual

Towing a trailer209
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data additional mirrors fitted. Both exterior mirrors should be mounted
on hinged extension brackets. Adjust the mirrors to give sufficient
vision to the rear.
Headlights
Before starting a journey, check the headlight beam settings with
the trailer hitched up. If necessary, alter the height of the headlight
beams by means of the headlight range control ⇒page 56.
Power supply
When you remove the ignition key the power supply to the trailer is
interrupted.
Removable ball joint coupling
Vehicles with a factory-fitted towing bracket are equipped with a
removable ball joint coupling. It is carried under the floor panel on
the left-hand side of the luggage compartment.
Note
We recommend having the car serviced between the normal inspec-
tion intervals if it used frequently for towing a trailer.Applies to vehicles: with towing bracketTrailer stabilisation system
Trailer stabilisation helps to reduce the risk of the vehicle
skidding when towing a trailer.When is the trailer stabilisation system activated?
Trailer stabilisation is active when the following requirements are
met:•
The ESP must NOT be switched off ⇒page 196,
•
The trailer connector must be properly secured in the vehicle
socket.
•
Vehicle speed must be higher than approx. 60 km/h.How trailer stabilisation works:
In many cases, the driver can stabilise a swaying trailer by manually
braking the vehicle.
However, if the ESP detects that the trailer is swaying and this is
affecting the towing vehicle, it will automatically brake the vehicle
to stabilise the trailer by slowing it down. The warning lamp
 will
light up in the instrument cluster. If possible, do not turn the
steering wheel at this stage.
In order to warn traffic behind you, the brake lights will come on
during this automatic braking operation.
A trailer weighing less than 70% of the kerb weight of the towing
vehicle may sway quite considerably without the trailer stabilisation
system intervening. This can happen when the swaying movements
of the light-weight trailer are not or hardly passed on to the towing
vehicle and are therefore not detected by the ESP.
If the system for activating the trailer brake lights is defective, this
will be indicated in the instrument cluster display ⇒page 36, “Bulb
monitor ”.
Requirements for correct functioning of the trailer
stabilisation system
If these conditions are not met in full, the trailer stabilisation system
will only intervene to a limited extent or not at all ⇒.
•
The electrical connection between the towing vehicle and the
trailer must be functioning correctly, without any defects.
•
The load on the trailer must be properly secured.
•
The tyre pressures on both the vehicle and the trailer must be
adapted to the load that is being carried.
•
Where possible, operate the trailer with the maximum permitted
draw bar weight.
•
The trailer overrun brake must be set correctly. This is important
to ensure that the trailer can be braked correctly, to avoid the vehicle
and trailer “jack-knifing” and to prevent excess braking of the trailer.
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Towing a trailer 210•
In low outside temperatures, both the towing vehicle and the
trailer should be fitted with winter tyres.
WARNING
It is essential that you adjust your speed to suit the weather, road
and traffic conditions. Do not let the trailer stabilisation system
tempt you into taking any risks when driving – this can cause acci-
dents.•
The ESP and trailer stabilisation system cannot defy the laws
of physics. This should be kept in mind, particularly on slippery
and wet roads and when towing a trailer with a light load.
•
The trailer stabilisation system is functional, regardless of
whether the trailer has a mechanical overrun brake or not.
•
The trailer stabilisation system is not always able to detect
swaying of trailers with a light load and will therefore not inter-
vene.
•
A trailer can still “jack-knife” on slippery roads with little grip,
even if the towing vehicle is equipped with the trailer stabilisation
system.
•
Trailers with a high centre of gravity may even tip over before
they start to sway sideways.
•
If you are not towing a trailer, but the trailer socket is being
used (e.g. for an illuminated bicycle rack), the trailer stabilisation
system may be activated in extreme driving conditions.
•
Please note the additional information and warnings
⇒page 210.
Notes on towing
Driving with a trailer always requires extra care.Weight distribution
Try to avoid towing a loaded trailer with an unladen vehicle. If this
cannot be avoided, drive extra slowly to allow for the unbalanced
weight distribution.
Speed
The stability of the car and trailer is reduced with increasing speed.
For this reason it is advisable not to drive at the maximum permis-
sible top speed in unfavourable road, weather or wind conditions.
This applies especially on a downhill gradient.
You should always reduce speed immediately if the trailer shows
the slightest sign of swaying. Never try to stop the swaying by accel-
erating further.
Always brake in good time. If the trailer has an overrun brake, apply
the brakes gently at first and then firmly. This will prevent the jerking
that can be caused by the trailer wheels locking. Change down in
good time before going down a steep hill so that you can use the
engine braking effect to slow down the vehicle.
Swaying and pitching can be reduced by stabiliser aids. We recom-
mend having stabiliser aids installed when towing trailers with a
high trailer weight. They can be purchased and installed at an Audi
dealer.
Overheating
When climbing long hills in hot weather with the engine running
fast in low gear, you should keep an eye on the coolant temperature
gauge ⇒page 11. Reduce speed immediately if the needle moves to
the top end of the scale. If the temperature warning lamp
 in the
instrument cluster should start flashing, stop the car and let the
engine cool down by running it at idling speed for a few minutes.
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Towing a trailer211
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Accessories
Before mounting equipment and accessories (e.g. bicycle
rack) please observe the following notes.The equipment/accessories mounted must not protrude more than
700 mm from the ball joint .
The total weight (mounted equipment plus the load) must not
exceed 75 kg.
The maximum load depends on where the centre of gravity lies.
The maximum weight decreases as the distance between the centre
of gravity and the ball joint increases.
The following limits apply:
If the distance is 300 mm, the total weight (incl. the equipment
mounted) must not exceed 75 kg.
If the distance is 600 mm, the total weight (incl. the equipment
mounted) must not exceed 35 kg.
Only bicycle racks for a maximum of three bicycles may be used.
Equipment mounted on the towing bracket
We recommend that you only mount equipment (e.g. bicycle rack)
which has been approved by Audi on the ball joint. If you wish to
attach other equipment please make sure that it has been approved
by the manufacturer for use on the ball joint. If you mount unsuit-able equipment, this can cause damage to the towing bracket. In an
extreme case, damage to the towing bracket could cause it to break
⇒.
WARNING
•
If you wish to mount equipment which has not been approved
by Audi please ensure that it is suitable for use on Audi vehicles.
•
Use of unsuitable equipment can result in severe damage to
the towing bracket. The towing bracket could then break while
pulling a trailer and cause an accident.
•
Never use tools of any kind when fitting and removing the ball
joint. This could damage the mechanism which locks the ball joint
in place and impair its safety (accident risk).
Removable towing bracketApplies to vehicles: with removable towing bracketIntroduction
Special care is required when fitting and removing the
towing bracket.
Fig. 205 Load distribu-
tion of equipment and
accessories
A1A1
AAAB
Fig. 206 Luggage
compartment with
towing bracket
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Towing a trailer 212The removable ball joint attachment for the towing bracket is stored
under the floor panel on the left-hand side of the luggage compart-
ment.
The ball joint can be fitted and removed by hand.
WARNING
Never use tools of any kind when fitting and removing the ball
joint. This could damage the mechanism which locks the ball joint
in place and impair its safety (accident risk).
Note
•
Do not attempt to modify or repair the ball joint or other towing
bracket components.
•
Should you have any difficulties when using the towing bracket,
or suspect that it is not fitted properly, contact a qualified workshop.
•
Before setting off, always check that the ball joint is secured
properly ⇒page 214.
•
Never disengage the ball joint with the caravan / trailer still
hitched or with a bicycle rack or similar accessory still attached.
•
It is advisable to remove the ball joint when you are not towing a
trailer. Fold the socket back to its original position so that the
mounting fixture is properly closed.
•
The ball joint must be removed if you intend to clean the car with
a steam cleaning attachment. Make sure that the mounting fixture
is properly closed.
•
For installation and removal of the ball joint we recommend that
the gloves provided be used.
Applies to vehicles: with removable towing bracketFitting the ball joint (step 1)– Remove the bumper cover to access the socket unit.
– Fold the socket unit all the way out in the direction of the
arrow ⇒fig. 207.
– The cover piece is held automatically in the open posi-
tion.
– Check that the mounting for the towing bracket, which
will now have become visible -arrow- ⇒fig. 208, is free of
dirt, and clean if necessary ⇒.
Fig. 207 Area below
rear bumper: Folding
down the socketFig. 208 Socket
(folded down)
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Towing a trailer213
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
– Also check the shaft section of the ball joint and its asso-
ciated mechanical parts to make sure they are clean and
undamaged.Continued ⇒page 213, “Fitting the ball joint (step 2)”.
WARNING
It is important to keep the mounting fixture clean. Otherwise the
ball joint may fail to engage securely (accident risk).Applies to vehicles: with removable towing bracketFitting the ball joint (step 2)The spring mechanism inside the ball joint must
be in the "ready" position.
– Check that the red marking ⇒fig. 209 on the knob is
inside the green zone on the ball joint.
– Check that the locking ball is inside the hole in the
shaft section of the ball joint.
– Check that the knob protrudes visibly from the ball joint,
so that there is a clear gap between the knob and the
ball joint.
The ball joint can only be installed if the internal spring mechanism
is in the ready position.
Continued ⇒page 213, “Fitting the ball joint (step 3)”.Applies to vehicles: with removable towing bracketFitting the ball joint (step 3)Setting the spring mechanism to the "ready"
position (if required)
– Insert the key ⇒fig. 210 for locking the ball joint into
the lock on the knob and turn it clockwise.
Fig. 209 Removable
towing bracket: Ball
joint
A2A1A3
Fig. 210 Removable
towing bracket:
Setting the spring
mechanism to the
"ready" positionFig. 211 Removable
towing bracket:
Inserting the ball joint
A4
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Towing a trailer 214
– Pull out the knob in direction , hold and turn in direc-
tion until the locking ball engages ⇒.
Inserting the ball joint
– With the spring mechanism in the “ready” position,
insert the ball joint into the mounting fixture and push it
upwards ⇒page 213, fig. 211 in the direction indicated
(arrow) ⇒. The spring mechanism should then
engage automatically with an audible click.
– Lock the ball joint by turning the key anti-clockwise.
– Take out the key and press the cover cap provided onto
the lock.Continued ⇒page 214, “Fitting the ball joint (step 4)”.
WARNING
•
If it is not possible to set the spring mechanism to the "ready"
position as described above, do not use the ball joint. Please take
your vehicle to a qualified workshop.
•
To avoid injury, keep your hands away from the knob and the
cover piece when inserting the ball joint into the mounting fixture.Note
Make sure that the knob can turn freely when the ball joint is
inserted.
Applies to vehicles: with removable towing bracketFitting the ball joint (step 4)Safety check
– Check that the green marking ⇒fig. 212 on the knob
is inside the green zone on the ball joint.
– Check that the knob is directly against the ball joint, so
that there is no gap between the knob and the ball
joint.
– Check that the ball joint is locked and the key is removed
(so that the knob cannot be pulled out).
Aa
Ab
A5
Fig. 212 Removable
towing bracket: Safety
checkFig. 213 Area below
rear bumper: Electrical
socket for trailer
A6
A7
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Towing a trailer215
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
– Check that the ball joint fits tightly in the mounting
fixture (try moving it about to check).
Electrical socket for trailer
– The cable of the towing bracket can be connected to the
socket ⇒page 214, fig. 213.If the safety check is not satisfactory, the ball joint must be fitted
again properly.
WARNING
To avoid accidents, the ball joint must meet all the safety require-
ments listed in the safety check. The towing bracket must not be
used if any one of these requirements is not met. If this is the case,
you should contact a qualified workshop.Applies to vehicles: with removable towing bracketRemoving the ball joint
– Take off the cover cap and insert the key ⇒fig. 214 in
the lock on the knob.
– Unlock the ball joint by turning the key clockwise.
– Take hold of the ball joint and pull out the knob in direc-
tion .
– Keep hold of the knob and turn it as far as it will go in
direction .
– Release the knob. The spring mechanism will remain in
the "ready" position ⇒.
– Pull the ball joint down out of the mounting fixture.
– Then swivel the socket up ⇒fig. 215 as far as it will go.
The mounting fixture will be closed automatically.
– Fit the bumper cover over the opening on the bumper.
– Put away the ball joint attachment under the floor panel
in the luggage compartment.
Fig. 214 Removable
towing bracket:
Removing the ball joint
Fig. 215 Area below
rear bumper: Folding
up the socketA8
Aa
Ab
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Towing a trailer 216
WARNING
M a k e su re t h a t t he so ck e t u ni t has closed off the mounting fixture
of the towing bracket properly. Otherwise the ball joint may fail to
engage securely if dirt accumulates in the mounting fixture.Towing bracket (retrofitting)
If required, the vehicle can be retrofitted with a towing
bracket.If a towing bracket is to be fitted after the car is purchased, this must
be done according to the instructions of the towing bracket manu-
facturer.The securing points, which are marked by an in the illustrations
⇒fig. 216 and ⇒fig. 217, are located under the vehicle.
Audi dealers are familiar with the method of installation and any
modifications which may be required for the cooling system.
WARNING
•
If a towing bracket is retrofitted, the installation should be
carried out by a qualified workshop.
•
If the towing bracket is incorrectly fitted, this could cause a
safety risk.
•
For your own safety, please observe the instructions provided
by the manufacturer of the towing bracket.Caution
If the connector socket is not fitted correctly, this could cause
damage to the vehicle's electrical system.
Fig. 216 Positions of
securing points (side
view)Fig. 217 Positions of
securing points (from
above)
AA
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Towing a trailer217
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
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218
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