Mercedes-Benz GLA 180 Owner's Manual page 341

Tyre pressure
338
Only screw standard valve caps or valve caps
specifically provided by Mercedes-Benz for
your vehicle onto the tyre valve.
G
WARNING
If the tyre pressure drops repeatedly, the
wheel, valve or tyre may be damaged. Tyre
pressure that is too low may result in a tyre
blow-out. There is a risk of accident.
Check the tyre for foreign objects.
R
Check whether the wheel is losing air or the
R
valve is leaking.
If you are unable to rectify the damage, con-
tact a qualified specialist workshop.
H
Environmental note
Check the tyre pressure regularly, at least
every 14 days.
The recommended tyre pressures for various
operating conditions can be found on the tyre
pressure table on the fuel filler flap
( page 164).
Y
Operation with an emergency spare wheel:
information on operation with an emergency
spare wheel can be found in the general notes in
the "Emergency spare wheel" section
( page 348).
Y
Operation with a trailer: the applicable value
for the rear axle is the maximum value stated in
the tyre pressure table inside the fuel filler flap.
Additionally, the tyre pressure table may also
state tyre pressures for different load condi-
tions. These are defined in the table as different
numbers of passengers and amounts of lug-
gage. The actual number of seats may vary; for
more information, please refer to the vehicle
documents.
If tyre sizes are not specified, the tyre pressures
stated on the tyre pressure table apply for all
tyres approved at the factory for this vehicle.
If a tyre size precedes a tyre pressure, the fol-
lowing tyre pressure information is valid only for
that tyre size.
Use a suitable pressure gauge to check the tyre
pressure. The outer appearance of a tyre does
not give any reliable indication of the tyre pres-
sure. On vehicles fitted with the electronic tyre
pressure monitor, you can also check the tyre
pressure using the on-board computer.
If possible, correct tyre pressures only when the
tyres are cold.
The tyres are cold:
if the vehicle has been parked with the tyres
R
out of direct sunlight for at least three hours
and
if the vehicle has been driven less than
R
1.6 km
Depending on the ambient temperature, the
vehicle speed and the load on the tyres, the tyre
temperature and thus the tyre pressure changes
by approximately 10 kPa (0.1 bar/1.5 psi) per
10 †. Take this into account when checking the
pressure of warm tyres. Correct the tyre pres-
sure only if it is too low for the current operating
condition.
Driving with a tyre pressure that is too high or
too low can:
shorten the service life of the tyres
R
cause increased tyre damage
R
have a negative effect on handling character-
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istics and thus driving safety (e.g. aquaplan-
ing)
The tyre pressure values given for low loads are
minimum values that offer you good driving
comfort characteristics.
However, you can also use the values given for
higher loads. These are permissible and will not
adversely affect the running of the vehicle.