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disc brakes only push against the disc, they don't pull away. generally they are bumped back on their own. Two things can make them not bump back - your wheel bearings show zero flex (good) and your discs are perfect (good), or your calipers aren't sliding well (not bad) or stuck (bad).
Try this... go to a parking lot, roll in without using your brakes and ensure that you can hear it. Find an open space and do a full circle left, then right as hard as you can at neutral throttle. If the scraping sound goes away, it means that the pads were knocked back and your sliders are good. This means that the friction is so light that it doesn't matter.
If not, then as above, take apart your calipers and lube the sliders, if they are bad, then replace them.
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