It actually started sounding off in amsterdam, but at that point it was just making a tiny bit of noise and I thought it might just the brake disc being a bit out of alignment so i just kept driving all the way to south Sweden, where it got much worse. A brake disc problem wouldn't be all that much of a problem on a rear wheel anyway, considering 80% of the braking happens on the front wheels. So in total, I probably drove 2500 km with it before i had to stop.