I just changed the front rotor and pads. The rotors have the minimum thickness. The torque specs for the mounting bolts. The diameter, the brand and the direction of rotation printed to the side that faces out between the bolt holes. The rotor I removed had a minimum thickness of 1.5mm and squalled when it wormed up going down a steep grade. The replacement rotor has a minimum thickness of 1.8mm. The pads I replaced were not worn out all the way. The new pads are Kool Stop ceramic instead of the sintered.