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I’d like to know why it works so well for the 100 or so times I’ve done it? When combined with some sort of cleaning fluid.
Because you've cleaned it.
Sanding takes off the embedded pad material from the rotor (which is microns thick, not enough to hold a contaminant) so it's useful when switching to another pad compound, but there's no reason to do it when cleaning. All it does is mean you have to repeat the bedding in process again, and wears your rotors and pads out quicker.
TooTallTim
Tim has spoken! I’d like to know why it works so well for the 100 or so times I’ve done it? When combined with some sort of cleaning fluid. If I drop the sandpapering I get worse results.