2008 Alfa Romeo 166 wheel torque

117
VDC AND ASR
SYSTEMS
(on request for versions/markets
where applicable)
VDC SYSTEM (VEHICLE
DYNAMICS CONTROL):
GENERAL
The VDC is an electronic vehicle stability
control system which, acting on the
torque and braking the wheels in a differ-
entiated manner, helps to bring the car
back to the correct course in the event of
loss of grip.
While travelling the car is subjected to
lateral and longitudinal forces that may
be controlled by the driver up to when
the tyres offer adequate road-holding;
when this falls below the minimum level,
the car starts to deviate from the course
required by the driver.Above all on rough surfaces (such as
cobbles, or due to the presence of water,
ice or soil), changes in speed (when ac-
celerating or braking) and/or course
(bends or the need to avoid obstacles)
can cause the tyres to lose grip.
When the sensors detect the conditions
that would lead to skidding, the VDC sys-
tem acts on the engine and brakes gener-
ating a stabilising torque.
The system performance
levels, in terms of active
safety, should not induce the dri-
ver to run pointless and unjustified
risks. Driving conduct should al-
ways be suited to the conditions of
the road surface, vision and traf-
fic. The responsibility for road safe-
ty is always and anyway the ve-
hicle driver’s concern.
The VDC system helps the driver
to keep control of the car in the
event of loss of tyre grip.
The forces induced by the VDC sys-
tem to control the lack of stability
of the car always and anyway de-
pend on the grip between the tyre
and the road surface.
WARNING

141
greatly reduced when there is ice or snow
on the road. Under these conditions the
stopping distance is increased despite the
use of the ABS system.VDC SYSTEM (VEHICLE
DYNAMICS CONTROL):
The VDC is an electronic vehicle stability
control system which, acting on the torque
and braking the wheels in a differentiated
manner, helps to bring the car back to the
correct course in the event of loss of grip.
When the sensors detect the conditions
that would lead to skidding, the VDC sys-
tem intervenes on the engine and on the
brakes producing a stabilising torque.
BRAKE ASSIST (Brake assist in
an emergency)
This system, that cannot be cut out, rec-
ognizes emergency braking on the
ground of the brake pedal operation
speed and allows to speed up the braking
action.
On versions fitted with VDC system, Brake
Assist is deactivated in the event of VDC
system failure (indicated by the switching
on of the relevant warning light).
The ABS system does not
dispense the driver from
driving carefully, especially when
the road is icy, snowed over or
wet.
WARNING
The car is fitted with an
electronic braking device
(EBD). if the
>andxwarning
lights turn on at the same time, this
means that there is an EBD system
fault; in this case violent braking
may be accompanied by early rear
wheel locking, with the possibility
of skidding. Drive the car extremely
carefully to the nearest Authorized
Alfa Romeo workshop to have the
system checked.
WARNING
The turning on of only
the
>warning light
with the engine running normally
indicates a fault to the ABS system
only. In this case the braking sys-
tem is still efficient, though with-
out the aid of the anti-lock device.
Under these conditions perfor-
mance of the EBD system may be
reduced. In this case too, you are
advised to go immediately to the
nearest Authorized Alfa Romeo
workshop, driving in such a way
as to avoid sharp braking, to have
the system checked over.
WARNING
The system performance
levels, in terms of active
safety, should not induce the dri-
ver to run pointless and unjustified
risks. Driving conduct should al-
ways be suited to the conditions of
the road surface, vision and traf-
fic. The responsibility for road
safety is always and anyway the
vehicle driver’s concern.
WARNING

144
– Two or more spare wheels should never
be used together. Have the wheel changed
repaired and refitted as soon as possible.
Rims
The bolts should be tightened to a
torque of 86 Nm (8.8 kgm).
Tyres
The tyres installed on the vehicle are of
the tubeless type and do not have an in-
ner tube. To obtain the greatest degree of
comfort, safety and length of life of the
tyres, the following recommendations
should be observed.
– With new tyres do not drive at full
speed until the first 100 km have been
reached.
– Before entering a tight bend, even if
the vehicle permits it, reduce speed.
– Avoid sharp acceleration and unneces-
sary braking.
– Do not travel for long periods at sus-
tained high speed especially on rough
roads.– Have the wheels balanced and the
front and rear axles set correctly.
– Avoid hitting the side walls of the
tyres, for example when parking.
– Never tamper with the valve on the
tyre.
– Do not insert anything between the
rim and the tyre.
– If the rim is bent, have it replaced.
– In the event of an abnormal drop in
the tyre pressure replace the wheel and
have it checked.
– When balancing the wheels use the
counterweights which are specifically de-
signed for tubeless tyres. To balance light
alloy rims only Alfa Romeo original
weights should be used.
– The tyre pressure, including that of
the spare wheel must reflect the indica-
tions given in the “Technical specifica-
tions” of this manual.
– Have the tyres checked periodically to
ensure that they are not damaged in any
way.– Second-hand tyres of unknown origin
or over 6 years old must only be used in
emergencies and with great care.
– Inner tubes must not be fitted to
tubeless tyres.
– Avoid parking the vehicle on the edge
of a step or other irregularities in the road
surface.
– Have the tyre tread checked periodi-
cally and replace when the legal mini-
mum is reached.
IMPORTANT Some types of tyres are
fitted with wear indicators. As soon as
these wear indicators appear on the tyre
tread, the tyres must be replaced.
Periodically check that the tyres are not
showing signs of irregular tread wear. If
they are, contact Alfa Romeo Authorized
Services who will eliminate the cause of
irregular wear.
Tread wear increases the danger of
aquaplaning on wet surfaces.

164
– Put jack and tools back in the bag
and stow it in the boot
Do not grease the threads
of bolts before installing
them; they might slip out.
The bolts should be tightened to a
torque of 86 Nm (8.8 kgm).
You are advised to have the wheel
bolt tightening checked by Alfa
Romeo Authorized Services as
soon as possible.
Indeed, insufficient tightening may
cause the wheel bolts to slacken
with the obvious dangerous con-
sequences. Excessive tightening
can strain the bolts.
WARNING
A0D0053m
fig. 19
A0D0052m
fig. 22
612PGSm
fig. 18
A0D0140m
fig. 17
A0D0142m
fig. 21
A0D0141m
fig. 20