In Brake Material and what the different materials used to make Brake Pads should be used with/
In many cases Stinted Bronze Pads are used with Iron Rotors when they where designed for Stainless Steel Rotors and they do wear out the Iron Rotors quite quickly because they where never designed for the Iron Rotors but to displace water off the Stainless ones so you could stop reliably with the Stainless Steel ones fitted.
Prior to stinted Bronze Pads being developed people who had Stainless Steel Disk Rotors [i]Read that as Japanese Motor Cycle Riders[/i] could apply a lot of front brake and nothing happened as a fine film of water was allowed to remain between the Pads and Rotor. Not very good for stopping in an emergency in the wet but at least the rotors never rusted like the Iron ones would and look grotty. :D
In those cases looks are far more important that usefulness as after you park your bike in the side of a car and kill yourself the bike remains still look good and nothing is rusting because you could stop long before you ever came near the object that you hit. :^0
I lost count of the number of times that I was told that there was something wrong with my every day rider an 860 GTS because when I parked it in a light rain the Disc Rotors would begin to rust and because it didn't look right there must have been something wrong with the bike as none of the others in the parking lot did that. The fact that they also didn't stop or even slow down in the wet was immaterial that's just how they performed in those days. Now Days it's the Disk Pads that rust and allow the Stainless Steel Rotors to keep looking nice and new.
Col