I understand there is a central, a front and rear block. No valves at the shock themselves. In the front and rear there is a left, right, and crossover valve to allow for the raising or lowering of an independent corner, and cross link to allow air to move from one side to the other for cross-link scenarios. The central one is used to either provide pressurised air to a corner from the tank or to exhaust gas when lowering. Various valves can be opened at any one time.
Common valve block faults include leaking internally in the block or to atmosphere. As the system will see the lowering of a corner over time it will compensate by lowering the opposite corner to match, lowering and end of the vehicle evenly, rather than lopsided.
That’s enough, there’s more than enough about this on the internet and this forum.
2010 TDV6 3.0L Discovery 4 HSE
2007 Audi RS4 (B7)
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