The front arms' rubber bushes go, but you can usually see cracks with a torch if you turn the steering each way and look at the rubber bushes.
You also have 2 front antirollbar links and the antirollbar itself (with built-in inner bushes).
The rear axle has adjustable track but the rod bushes don't usually fail.
Air suspension cis more fidgety that steel due to the internal friction of the rubber air springs but those used in the A8 are quite a good design in this respect.
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