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This is unlikely but are all the bleed nipples at the top of the calipers? I once had a car that someone had switched calipers left to right on the front. Mounted fine but left the nipples down. Air rises and brakes would not bleed. Still can't figure out how they bled them. Problem only appeared when I took it to a pro to replace hoses. They spent several hours trying to bleed the system (and installed a new MC which I didn't need) before noticing the problem. A reputable Porsche shop too! They were embarrassed to say the least.
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