my car has a brake disc that has been grooved by a pad wearing down and it going metal to metal. It has 3 circular grooves running round it in the outer 1/4 of the disc on one side. it is still nice and shiney apart from this (and even in the grooves since the pads seem to wear to match it)
will this be an MOT failure or is it okay?
If it were a normal disc i would happily replace it (i have the new ones in the house!), but it doesnt just unscrew and come off - it appears that the wheel bearings are inside the hub of the brake disc making it more complicated as you have to knock them out and refit them afterwards.