Mercedes-Benz GLC 200 4MATIC Owner's Manual page 426

monthly
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when the load changes
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before embarking on a longer journey
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if operating conditions change, e.g. off-
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road driving
Adjust the tyre pressure, if necessary.
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Tyre pressure which is too high or too low can:
Shorten the service life of the tyres.
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Cause increased tyre damage.
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Adversely affect driving characteristics and
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thus driving safety, e.g. due to aquaplaning.
& WARNING Risk of accident due to repea-
ted pressure drop in the tyres
The wheels, valves or tyres could be damaged.
Too low a tyre pressure can lead to the tyres
bursting.
Examine the tyres for foreign objects.
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Check whether the tyre has a puncture
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or the valve has a leak.
If you are unable to rectify the damage,
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contact a qualified specialist workshop.
Information on the recommended tyre pressure
for the vehicle's factory-fitted tyres can be found
on the tyre pressure table on the inside of the fuel
filler flap ( page 423).
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Use a suitable pressure gauge to check the tyre
pressure. The outer appearance of a tyre does not
permit any reliable conclusion about the tyre pres-
sure.
Only correct tyre pressures when the tyres are
cold. Conditions for cold tyres:
The vehicle has been parked with the tyres out
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of direct sunlight for at least three hours.
The vehicle has travelled less than 1.6 km.
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The vehicle's tyres heat up when driving. As the
temperature of the tyres increases, so too does
the tyre pressure.
Vehicles with a tyre pressure monitoring system:
you can also see the tyre pressure in the driver's
display ( page 424).
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Wheels and tyres 423
Notes on trailer operation
Always inflate the rear axle tyres to the recom-
mended tyre pressures on the tyre pressure table
for increased load.
Tyre pressure table
The tyre pressure table is on the inside of the fuel
filler flap.