A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009)
The bubble adjustment - A - serves to compare the ground conditions.
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Move the (VAS 6430) sideways - arrow B - until the display on the alignment computer is within the tolerance range.
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Secure the (VAS 6430) by tightening the bolts - 2 - and - 3 - slightly. (This prevents the ( VAS 6430) from rolling away.)