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Advice
Wheel bolts
The design of wheel bolts is matched to the
rims. If differ
ent wheel rims are fitted, the
correct wheel bolts with the right length and
correctly shaped bolt heads must be used.
This ensures that wheels are fitted securely
and that the brake system functions correctly.
In certain circumstances, you should not use
wheel bolts from a different vehicle, even if it
is the same model ››› page 247.
WARNING
If the wheel bolts are not tightened correctly,
the wheel cou
ld become loose while driving.
Risk of accident.
●
The wheel bolts must be clean and turn
easily. Never apply grease or oil to them.
●
Use only wheel bolts which belong to the
wheel.
●
If the prescribed torque of the wheel bolts
is too low, they could loosen whilst the vehi-
cle is in motion. Risk of accident! If the tight-
ening torque is too high, the wheel bolts and
threads can be damaged.
CAUTION
The prescribed tightening torque for wheel
bolts
for steel and alloy wheels is 120 Nm.
Tyre monitoring indicator*
Fig. 234 Centre console: tyre monitoring sys-
t
em b
utt
on.
The tyre monitoring system compares wheel
r
ev
o
lutions alongside the wheel diameter of
each wheel, with help from the ESC. If the di-
ameter of a wheel changes, the tyre monitor-
ing indicator lights up . The wheel diame-
ter changes when:
●
Tyre pressure is insufficient.
●
The tyre structure is damaged.
●
The vehicle is unbalanced because of a
load.
●
The wheels of one axle are under more
pressure (for example, driving with a trailer or
on steep slopes).
●
The vehicle is fitted with snow chains.
●
The temporary spare wheel is fitted.
●
The wheel on one axle is changed.
Tyre pressure adjustment
After modifying tyre pressure or changing any
wheels, the new tyre pressure must be stored
in the Easy Connect system with the
but-
t
on and the
S
ET
TINGS
function button
›
›
›
page 34.
In vehicles without a radio, press and hold
down the button ››› Fig. 234, with the
ignition on, until an acoustic signal is heard.
If the wheels are under excessive load (for ex-
ample, driving with a trailer or heavy load),
the tyre pressure must be increased to the
recommended value for a full load (see the
sticker on the back of the left front door
frame). If the tyre monitor system button is
pressed down, the new tyre pressures are
confirmed.
The tyre pressure control lamp lights up
If the tyre pressure of a wheel is much lower
than the value set by the driver, then the tyre
pressure control lamp ›››
will light up.
WARNING
●
When the tyre pr
essure control lamp lights
up, reduce speed immediately and avoid any
sudden turning or braking manoeuvre. Stop
when possible, and check the tyre pressure
and status.
●
The driver is responsible for maintaining
correct tyre pressures. For this reason, tyre
pressure must be regularly checked.
278
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