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Wheels and tyres
The pressure should therefore be checked at
l
east once a month and bef
or
e starting a
journey.
As a general rule, the pressures given are for
cold tyres. When the tyres are hot, the pres-
sures are greater.
Never deflate a hot tyre in order to obtain the
required pressure. This could result in very low
tyre pressures which may lead to sudden
blow-outs.
Checking tyre pressures
Tyre pressures should only be checked when
the vehicle has not been driven for more than
a few kilometres (miles) at low speeds in the
past three hours.
●
The tyre pressures should be checked reg-
ularly, and only when the tyres are cold. Al-
ways check all the tyres. Tyre pressures
should be checked more often in colder re-
gions, and only when the vehicle has not
been driven recently. Always use a correctly-
operating tyre gauge.
●
Adjust tyre pressures to the loads carried in
the vehicle.
●
After checking the pressure, always replace
the valve caps, and where applicable, ob-
serve the instructions given for adjusting the
tyre control system
›››
page 298.
WARNING
If tyre pressures are too high or too low, the
tyre may defl
ate or burst suddenly while
driving. This could result in a serious acci-
dent.
●
If the tyre pressure is too low, they could
overheat, resulting in tread detachment or
even burst tyres.
●
When driving at high speeds and/or fully
loaded, the tyre could suddenly overheat,
burst or be subject to tread detachment,
with the resultant loss of control of the ve-
hicle.
●
Tyre pressures which are too high or too
low reduce the service life of the tyre, af-
fecting the vehicle's performance.
●
Tyre pressures should be checked regu-
larly, at least once a month and before
long journeys.
●
Adjust the pressures of all the tyres to the
vehicle load.
●
Never deflate excess pressure from hot
tyres.
CAUTION
●
Take car
e not to tilt the manometer when
placing it on the valve. Otherwise, the valve
may be damaged.
●
If tyre valves are not protected by caps,
or if the caps are not screwed on correctly,
they may become damaged. Check that
the caps are identical to the standard caps
and have been correctly tight
ened.
For the sake of the environment
Under-inflated tyres will increase fuel con-
sumption.
Note
When checking tyre pressures, please ob-
serve the instructions for the t
yre control
system
›››
page 298.
Wear indicator depth profile
Fig. 302 Tyre profile: tread wear indicators.
Tread depth
Cert
ain driving conditions r
equir
e a deeper
tread, as well as needing the tread to be ap-
proximately the same on the front and rear
tyres. This is particularly important when
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