Air in brake system
I have had similar problems throughout the years not being able to get air out of a newly replaced caliper. Some remanufacturers of these calipers do not check, hone or sleeve the bores properly causing the seals to draw air into the system when retracting. You can check that caliper by carefully clamping off the brake hose to the caliper while slowly bleeding the caliper. If you get a solid pedal, you know the caliper is drawing air while retracting.
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