It seems logical that over time the natural wear of the brake pads will cause the rear to wear more than the front (due to twisting of the caliper and/or its mounting, under the force of braking), creating a taper that should diminish or eliminate the self-energizing property. But I have never had this happen, to the extent of eliminating squeal, in my own experience. If I didn't do something deliberately to angle the brake pads, they never got quiet on their own. Maybe I don't ride enough, or perhaps I don't use my brakes enough
