Brakes usually bed in after about 200-500 miles, but you were on the highway probably most of the time. Might want to have the dealer check that out.

As far as the steering feel, the 4.8is that I drove had incredibly LIGHT steering at all speeds. Frankly I couldn't believe it. It was significantly lighter than my 4.4 with 19" tires. While it felt pretty easy moving around a parking lot, I felt like I had less confidence on the highway going 60+. I have to say that I love the 4.8 in every way (especially in the right color) but the steering was the worst I've felt in any BMW and I've driven a ton going back to the late 70's.