[island911]

Are you a skier, McLovin? Ever encounter washboard formations in the flatter run-outs? Well there's this thing where oscillations sets-up the geometry for more oscillations. The snow washboards are a macro example of what happens to brake surfaces. Another example could be dirt roads that get washboarded.

Anyway, resurfacing your rotors will give you the quickest solution. Whereas allowing the pads to slowly resurface those micro washboards is the slow path to the same solution.

It is interesting that the wheel change precipitated the problem. Natural frequencies are fundamentally based on stiffness per mass. Although typically the sympathetic frequencies happen when the brake pad wears (decreasing mass and increasing stiffness) - that's when the singing occurs.

meh. It would be interesting to hear if you still have the squealing after reinstalling the original wheels. I expect that you would, but would like to know. That is, I expect you've already 'cut a record' so to speak. and the disk surface is now predisposed to grab/slip of that squeal frequency. But maybe not. Perhaps the old wheels (and lower stiffness higher weight) damp the grab/slip of that squeal frequency at the pad.