Guys, fairly recently had my rear discs and pads replaced by Readview, all has been well of course (S60 D5)

Tonight however, I got out of my car after a motorway run and could smell hot brakes! It was the left hand rear, the wheel was really hot, brakes were stinking and the protective paint on the disc centre was burning off!!

Now, I did have a few hard braking moments during the journey, and having let it cool down I took it for a run, didn't get any hotter than I would deem normal, the car also moves freely which suggests the brakes aren't binding! Anything else could have caused that kind of heat? Failing bearing for example? Binding would seem favourite, but I can move it easily on a flat piece of tarmac, not resistance other than the cars weight.

Any suggestions welcome.

Gareth