just replaced the pads on the rapido Fiat ducato /alco chasis and a bit of a mix up with ordering online from gsf (wrong front pads £12-oo post office to return!) But I digress, the guy helping me (doing it really) who is a red hot mechanic builds cars race bikes etc. remarked that the rear brakes disc ect had seen remarkably little use and whilst he was not overly concerned wondered about the brake balance. I have never had any problem with brakes barring smoking fronts after a few Alpine and Pyrenees mountain decents. He declined to interfere. But I wonder if there is a way to check /or set up? may be an extra complication with alco chasis