207 If and when
Safety FirstControls and equipment Tips and Maintenance Technical Data
The inflation pressure is very important particularly at high speeds.
Therefore, the pressures should be checked at least once a
month and before every long journey.
At this opportunity do not forget the spare wheel:
• The spare wheel with normal tyre should always be inflated to
the highest pressure required on the vehicle.
• Always check the pressures when the tyres are cold. When warm,
the pressure is higher but do not reduce. If the load changes a
great deal the pressure must be altered to suit.
On vehicles with wheel hub caps, valve extensions are fitted. It is
not necessary to remove the valve extension piece in order to test
and correct the inflation pressure.
P Pr
re
es
ss
su
ur
re
es
s wwh
hi
ic
ch
h aar
re
e tto
oo
o hhi
ig
gh
h oor
r tto
oo
o llo
ow
w ssh
ho
or
rt
te
en
n tty
yr
re
e lli
if
fe
e –– qqu
ui
it
te
e
a ap
pa
ar
rt
t ffr
ro
om
m tth
he
e dde
et
tr
ri
im
me
en
nt
ta
al
l iin
nf
fl
lu
ue
en
nc
ce
e oon
n vve
eh
hi
ic
cl
le
e hha
an
nd
dl
li
in
ng
g.
.
F Fo
or
r tth
he
e ssa
ak
ke
e oof
f tth
he
e een
nv
vi
ir
ro
on
nm
me
en
nt
t
A pressure which is too low increases the fuel consumption and this
burdens the environment unnecessarily.
M Mo
od
de
e oof
f ddr
ri
iv
vi
in
ng
g
Fast cornering, hard acceleration and violent braking also increase
tyre wear.
B Ba
al
la
an
nc
ci
in
ng
g wwh
he
ee
el
ls
s
The wheels on new vehicles are balanced. However when the
vehicle is running various influences can cause the wheels to
become unbalanced and this causes steering vibration.
As imbalance also increases steering, suspension and tyre wear
the wheels should be balanced again. Furthermore a wheel should
always be rebalanced when the tyre has been repaired or when a
new tyre has been fitted.
I In
nc
co
or
rr
re
ec
ct
t wwh
he
ee
el
l aal
li
ig
gn
nm
me
en
nt
t
Incorrect wheel alignment not only causes excessive, usually
uneven, tyre wear but can also impair the vehicle’s safe handling.
In case of abnormal tyre wear, contact a Technical Service Centre.
W We
ea
ar
r iin
nd
di
ic
ca
at
to
or
rs
s
At the bottom of the tread of the original tyres there are 1.6 mm
high “wear indicators” running across the tread
⇒fig. 174. There
are 6-8 of these indicators – according to make – evenly spaced
around the tyre circumference. Marks on the walls of the tyre (for
example the letters “TWI” or triangles) show the locations of the
wear indicators.
A At
t cco
on
nt
ti
in
nu
uo
ou
us
s hhi
ig
gh
h ssp
pe
ee
ed
ds
s aa tty
yr
re
e iin
n wwh
hi
ic
ch
h tth
he
e ppr
re
es
ss
su
ur
re
e iis
s tto
oo
o llo
ow
w ffl
le
ex
xe
es
s
m mo
or
re
e aan
nd
d hhe
ea
at
ts
s uup
p eex
xc
ce
es
ss
si
iv
ve
el
ly
y.
. TTh
hi
is
s cca
an
n cca
au
us
se
e ttr
re
ea
ad
d sse
ep
pa
ar
ra
at
ti
io
on
n aan
nd
d tty
yr
re
e
b bl
lo
ow
w oou
ut
t.
.
W
WA
AR
RN
NI
IN
NG
G
