I think the prob is the calipers too.Easy fix,spray some cleaner to get rid of the crud on the pistons where they protrude from the calipers,then push 'em all the way back in,then pump 'em back out (with the caliper over the disc),repeat a couple of times.Give it a try it'll only take a few minutes.
One other question,are they firm once they take up the freeplay,or are they spongy?
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