I've been using the 107 this weekend and I've noticed some sqeaking from the rear end that gets worse when the brakes are on.
After a longish drive (40 mins), the alloy wheels are HOT to the touch on the rears, but ok on the fronts. Both rears are hot, not just one.
My assumption here is that I have dragging brakes. If it was on one side it would be easy - start with the flexible hose and if not that, the caliper. However, with both sides, I'm not so sure.
There is also quite a bit of brake dust on the rears (more than the fronts!)