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^^^ Maybe I am overthinking this but could the pulsing result from the pad "falling into" /being pressed into the gap at the circumference of the wavy disc? I guess that the relationship between the length of the pad or rather the footprint of its swept area and the length/depth of the scallop in the circumference of the disc could be critical i.e. if too much of the pad is unsupported by the disc when the brake is applied it could lead to brake piston oscillating and pulsing on the lever.
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