Couple of Q7 faults

[Monkeythree]

My 2011 Q7 3.0TDi is in the dealers at the moment having a couple of faults looked at but they've just rung me with the "computer says there's nothing wrong" line. The faults I asked them to look at are:

1) When going over speed bumps or heavy road undulations under light braking e.g. typically when going slightly downhill, the front right brake locks a touch and the ABS kicks in. Can feel it kick back through the pedal and get a couple of flashes from the stability control lamp on the dash. It doesn't happen on every speed bump but when it does, it's always the front right. My assumption was faulty ABS sensor?

2) When first started on cold mornings (<3deg) it sounds like the PAS pump is working overtime and there is some vibration back through the steering wheel. Also some strange feedback through the steering wheel when making the first few turns out of our estate. I wondered if the PAS fluid could have become contaminated with water and there are some ice crystals in the fluid? It goes away after 10-15 minutes when the car has warmed up.

If anyone knows anything about either of these two faults I would be grateful to know before I go back to the dealers.

TIA

[Dr G]

There's a hump back bridge near us that gives Q7s a similar 'moment' actually, does that wheel lock early/unpredictably when braking on the level?

[Monkeythree]

It can do yes, but typically when on the level I brake before speed bumps and then coast over them so it rarely happens that I get the little ABS wobble on the flat. Going downhill and feathering the brakes to control my speed it occurs more often but even then, not every time. I go over the same sets of speed bumps every day and some days I get a little lock up and some days nothing. Always only the front right though if it happens.

Got the car back from the Audi service centre today and they insist there is nothing wrong with it i.e. They found nothing in the memory to indicate a problem.