Volkswagen Passat 1995 Official Factory Repair Manual page 3363

Front Wheel Suspension, Shafts and Axle
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.40.1
Fig. 6 Installation position of right drive shaft
transmission end joint boot
The large diameter of vent chamber -A- must fit on
the larger diameter.
B - Vent hole
Fig. 7 Joint boot, ventilating
Often the boot is pushed in when installing on the
joint body. This creates a vacuum inside the boot
which draws a fold in (arrow) while driving. After
installing, lift the boot at small diameter end to
equalize pressure.
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