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37 12 ... Replacing Lower Vent Line

WARNING: This page is about a different car, the 2010 BMW X5, 2009 BMW X5, 2008 BMW X5, and 2007 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Risk of damage!
Extreme cleanliness must be ensured in the connection area of the vent lines during removal and installation. Even the smallest of dirt particles can cause leakage in the air spring system.

Necessary preliminary tasks: 

Disconnect quick-connect couplings (1, 3).

Seal connections of air supply unit supply line and upper vent line with sealing plugs.

Unclip lower vent line (2) and feed out.

Fig 1: Identifying Lower Vent Line And Quick-Connect Couplings
G04794839Courtesy of BMW OF NORTH AMERICA, INC.