Shame you can't test it though. I had the same issue then after bleeding it seemed fine, then a 10 minute ride and the back brake would start dragging and slowing me down. In the end it was a new cylinder from Moto rapido. The old cylinder would bleed normally but couldn't force fluid back from calliper to reservoir so same as when fluid expands due to heat. There's a bypass in the cylinder as you've probably seen in the previous threads linked here and I believe that was my problem
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