I started to get a bit of a vibration through the steering wheel on braking.. didn't happen all the time.. but enough to get on my nerves... got it checked out and front caliper was sticking.. bit of a problem on 3-series.

It was advised that it's best to replace the whole lot (discs/pads).. so that's what I did. I got some new calipers (pair) at a cost of £290 and a set of front discs/pads. The old man replaced these for me and freshened up the brake fluid.. so that's another 20-40K of motoring I don't have to worry about...