Q5 clunks from steering

[Tricuspid]

2018 Q5 ... every time I pull away, once the car hits 25mph (aka 40kmh) I hear and feel two metallic clunks in quick succession from the steering. Every time, always once per journey, always the same speed. If I stop and switch the engine off (but not if it cuts through stop/start) I get it again.

I spoke to a mechanic at the Audi dealer, he reckoned it could be something like Lane Assist cutting in once the car hits a certain speed. I suspect he's on the right lines (rather than it being broken) but my car doesn't have Lane Assist.

Initially I thought it was a broken spring, it has that slightly abstract mechanical feel, until I realised it was 100% repeatable. Then I worried it was the steering lock, and it might apply itself at the wrong moment. Certainly it's a bit suspicious that it happens at the same speed every time, which suggest the car is doing something. Any thoughts?

[DanSkoda]

It's the ABS carrying out it's self test function.
Perfectly normal, doesn't cause any harm. But is rather intrusive!

[Dr G]

I had in my head there was something to do with hold assist too (which in itself uses the ABS).

[Tricuspid]

Thanks, it is odd, haven’t had it with previous Audis. No hill assist on mine either, so it’s not that