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Yes, I, too, have heard many stories about calipers rebuilt wrong (i.e., one half upside down, so the air cannot be bled), but I'd like to suggest another possibility which I think is reported here on this list even more often:
During the process of bleeding the brakes (the first time, following a caliper replacement or just a fluid flush), it's often reported that one cannot remove the air, as indicated by the pedal thereafter being spongy (or going down too far), regardless of how many times it's rebled.
It usually turns out that during or right after the first bleeding, the brake pedal was pushed down too far (e.g., setting new pads?). This moves the piston into debris-laden areas of the bore, which scores and destroys the piston's seals. As a result, the master cylinder now has a major internal leak -- fluid flows from the high-pressure to the low pressure side of the piston ... there's no external leak or drop in fluid level, but the master cylinder can no longer generate and hold a pressure... and the brake pedal can slide down to the floor board with little resistance.
The only solution is a replaced master cylinder.
Anyway, this is another possibility.
Good luck.
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