A couple of times i've noticed this now. Mostly when turning and reversing but did do it once while i was pulling up forwards in to a parking space.
It feels like i've ran something over and i can feel the grinding through the pedals.
It's a pretty nasty noise and sounds like something's fallen off but when i drive forward again all is fine.
What could it be? My first thought was cv joint but it was on the ramp today and the guy at the garage never said anything about a burst boot or anything.