If the SA delivered brakes cause so much trouble, shouldn't that mean that they shoud be replacing it???..........and no its not normal for disc to be replaced after 50k km.....thats utter bs, maybe pads but definitely not the disc!!! Keep annoying them.....and if all else fails get a good set yourself and call your local mech to put it in, much cheaper and better..............For some reason I don't really trust dealer mechs, but thats cause my local mech is damn good