Mercedes-Benz CLA Operator's Manual page 340

Changing a wheel
338
Observe the following when raising the
vehicle:
to raise the vehicle, only use the vehicle-
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specific jack that has been tested and
approved by Mercedes-Benz. If used
incorrectly, the jack could tip over with the
vehicle raised.
the jack is designed only to raise and hold
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the vehicle for a short time while a wheel
is being changed. It is not suited for
performing maintenance work under the
vehicle.
avoid changing the wheel on uphill and
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downhill slopes.
before raising the vehicle, secure it from
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rolling away by applying the parking brake
and inserting wheel chocks. Never
disengage the parking brake while the
vehicle is raised.
the jack must be placed on a firm, flat and
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non-slip surface. On a loose surface, a
large, load-bearing underlay must be used.
On a slippery surface, a non-slip underlay
must be used, e.g. rubber mats.
do not use wooden blocks or similar
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objects as a jack underlay. Otherwise, the
jack will not be able to achieve its load-
bearing capacity due to the restricted
height.
make sure that the distance between the
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underside of the tires and the ground does
not exceed 1.2 in (3 cm).
never place your hands and feet under the
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raised vehicle.
never lie under the raised vehicle.
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never start the engine when the vehicle is
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raised.
never open or close a door or the tailgate
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when the vehicle is raised.
make sure that no persons are present in
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the vehicle when the vehicle is raised.
! The jack is designed exclusively for
jacking up the vehicle at the jacking points.
Otherwise, your vehicle could be damaged.
Steel wheel with wheel trim
Vehicles with steel wheels: carefully
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reach into two of the wheel trim openings
and remove the wheel trim.
Using lug wrench :, loosen the bolts on
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the wheel you wish to change by about one
full turn. Do not unscrew the bolts
completely.
The jacking points are located just behind the
wheel housings of the front wheels and just
in front of the wheel housings of the rear
wheels (arrows).