The wheel bearings that keep the rear wheels turning are heavily loaded, which can cause a wheel bearing to fail or wear out.

When a wheel bearing is worn out, it makes a singing, humming, and/or whistling sound. For example, this sound may be heard when turning left

but not when turning right (or vice versa). This purely depends on how the bearing is loaded at that moment.

Both the basic set and the complete set come with two gaskets, while Volkswagen has always used only one

between the backplate and the bearing housing cover. For better sealing, it is advisable to install a second gasket between the anchor plate and the bearing flange.

In the complete set, this second gasket has a larger inner diameter, while the second gasket in the basic set is the same as the first one.

In the basic set, you will need to enlarge the inner diameter to place it over the flange, whereas this is not necessary in the complete set.

The complete set comes with the outer spacer ring, which should not be confused with the inner ring (located behind the bearing).