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I don't think so, but I will check. I think that is the basis of the problem though, even when I manually push the lever back, the piston it's attached to doesn't fully reset.
On the attached pic, the good lever rests with the silver bar at A and moves to around B when using the brakes. On the bad lever it only ever goes back to B and moves to C when braking.
I can't physically push it back any further.
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Fluid can only flow between the reservoir/cup and the lever cylinder when the lever is in the fully relaxed position. If you push the lever away from the bar does the "blockage" disappear?
Diagram here. The bleed cup hole is on top of the reservoir:
https://en.wikipedia.org/wiki/Hydraulic_brake#/media/File:Hydraulic_disc_brake_diagram.gif