I've changed pads on a dozen different cars and never "sanded" them!!
If the rotors are within spec for thickness and are not heavily grooved, glazed or rusted (especially at the back of the rotor) I would just blow out the cross drill holes - they tend to hold brake dust - and fit the new pads and wires.
I found when I fitted new pads (Texstar) to my Boxster S last year, it pays to follow the break in procedure as per manufacturers instructions. This makes a big difference to overall braking efficiency and lifespan for the new pads.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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