Audi A4   Driving tips   Towing a trailer  Removable towing bracket
Area below rear bumper: Folding down the socket
Fig. 1 Area below rear bumper: Folding down the socket
Socket (folded down)
Fig. 2 Socket (folded down)
Applies to vehicles: with removable towing bracket
Fold the socket unit all the way out in the direction of the arrow Fig. 1.
The cover piece is held automatically in the open position.
Check that the mounting for the towing bracket, which will now have become visible -arrow- Fig. 2, is free of dirt, and clean if necessary WARNING!.
Also check the shaft section of the ball joint and its associated mechanical parts to make sure they are clean and undamaged.
Continued Link.
WARNING!
It is important to keep the mounting fixture clean. Otherwise the ball joint may fail to engage securely (accident risk).

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