changing disc brake pad material while keeping same rotors I would like to know what effect changing the material of a set of disc brake pads would have on the rotors if you kept them the same. for example, If I have resin pads and have been using them for the life of the rotors, what would happen if I switched to metal or organic pads, while still keeping the rotors the same? Would they just squeal like crazy?
thanks
Just called Shimano to ask this question for a customer's bike. For switching from a resin to a metallic padset, the answer is clean rotor with isopropyl alcohol and do a standard bed-in.

Didn't ask them about metallic to resin