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@Chaley
Let’s not forget who ever designed most calipers was is an idiot. To gravity bleed Shimano flat mount rears you have to get the hose to the highest point of the caliper. So it’s rest the bike on its back wheel and back of the seat, oh no wait that puts the fill port on the bars in the wrong place… the best way I’ve found is unbolt the calipers and lay them on something to get them in the correct position, bleed them and then bolt them back up. Sound like a faff, but it’s way quicker than chasing air down a hose. Front ones are the right way up when on the bike.
It could of course just be me being thick.