Installing the ball coupling
WARNING
If the vehicle/trailer combination is not
secured, the trailer may come loose. As a
result, you could cause an accident.
Therefore, make sure that the ball coupling is
secured with the bolt supplied and the
corresponding spring cotter.
WARNING
The ball coupling can be damaged if the nut is
tightened on the ball coupling with the
incorrect torque. This could cause the trailer
to detach while driving and an accident could
occur as a result.
Therefore, please observe the following:
- do not exceed the maximum permitted
noseweight of the ball coupling, the trailer
coupling and the trailer tow hitch.
- when installing, always use a retaining ring
between the nut and the mounting surface
of the ball coupling carrier.
- if the assembled ball coupling has been
permanently mounted on the vehicle, have
the ball coupling regularly checked for
correct installation and torque at a qualified
specialist workshop.
- check that the thread under the nut is of
the correct length
The detachable ball coupling is located in the stowage well under the cargo compartment floor.
– Open the cargo compartment floor.

Ball coupling and ball coupling stowage well
(example)
– Remove ball coupling 1 with the bolt and spring cotter from ball coupling stowage well 2.

Protective cap
– Pull protective cap 3 in the direction of the
arrow, out of the ball coupling recess.
– Place protective cap 3 into the ball
coupling stowage well.

Ball coupling recess

Hole in the ball coupling and ball coupling recess
– Insert the ball coupling horizontally into ball coupling recess 4 in the direction of the arrow, until the hole in ball coupling 5 and the hole in ball coupling recess 6 align.

Bolt
– Slide bolt 7 all the way into the hole in the ball coupling recess and the ball coupling.

Bolt and spring cotter
– Secure the bolt using spring cotter 8.

Correctly installed and secured ball coupling
– Check the ball coupling, bolt and spring cotter for correct installation.
WARNING
If the ball coupling is not correctly installed
and secured, the ball coupling and the trailer
could come loose. As a result, you could
cause an accident.
Therefore, please observe the following:
RMake sure that the ball coupling is secured
with the bolt supplied and the
corresponding spring cotter.
RIf the ball coupling cannot be correctly
mounted, remove the ball coupling. Under
these circumstances, the ball coupling
must not be used for trailer towing.
Have the entire trailer tow hitch checked at a
qualified specialist workshop.
See also:
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Showing the distance display
This function is only available with
DISTRONIC PLUS.
•► Press the button on the
steering wheel to select the DriveAssist
menu.
•► Press the button to select
Distance Display.
...
The mbrace system
The mbrace system provides different
services, e.g.:
• automatic and manual emergency call
• Roadside Assistance call
• MB Info call
To adjust the volume during an mbrace call,
proceed as foll ...
