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Possibly there might be air trapped in the side of the caliper that the bleed nipple is.
The pistons won't all move at the same time, just the ones with the least resistance then once they touch the next one will begin to move (obviously the movement is tiny), but they should be all engaged when the lever is pulled.
I feel like if you ever solve this you deserve some kind of accreditation from Magura
Same thing has happened again, one side the pistons won’t extend, other side right out, hardly any power
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