A week or so ago I noticed that when my car stopped from walking pace, the front wheels moved back about 25mm. When the brakes were released, the wheel immediately "jumped" forward about the same ammount. 5mm is about normal, so you can imagine my reaction when the wheels were moving an inch or more!
Apparently some of the rubbers are liquid filled and prone to leaking

(According to the dealer). I had noticed that the car appeared a little looser on the road, so this should fix the issues I hope. It's going in on Tuesday to have the rubbers replaced - I'll see if I can get some pix of the old rubbers
MySV6