The throbbing rotor has been cured. It was one of the worst yet. My usual method for stubborn rotors is to cut into the raised drum so that I can force a chisel between the hub and the rotor. In this case, I cut all around and separated the raised centre from the rotor face before I could break it free. Tommy suggests using No Seize; I've used such products before (and messed up the wheel nuts on the van with it), but perhaps the Bostik brand will yield better results. I realize that the reverse face of the disk was the problem. I think the slides seized so that the inner pad remained constantly on and built up a thick glaze on the rotor surface. When I freed the caliper and slides, the inner pad was able to press more firmly, and this cracked away part of the glaze, creating an uneven surface that throbbed like a warped rotor. Anyway, it's smooth as silk and the car is getting better gas mileage.
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