Just had four new tyres fitted to my 2017 1.6tdi dsg. On collection mechanics told me to keep an eye on my rear pads as they were low and my discs would need changing soon. I thought it was just the usual tactic employed by these garages(Kwik Fit/National etc) to get you just to get them changed there and then but when I got home I had a look. Sure enough both rear discs look excessively scored and will need changed. Is this normal for a 23000 mileage car. I'm assuming the mechanically handbrake