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bleed port on the lever is leaking
Right, I don't suppose you keep that Klein in the parts bin? You have my address yeah? :)
Leaky bleed port would maybe explain why some of the pistons weren't moving when the lever was pulled. Oil/air being displaced out through the bleed port instead of moving the pistons?
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Leaky bleed port would maybe explain why some of the pistons weren't moving when the lever was pulled. Oil/air being displaced out through the bleed port instead of moving the pistons?
At a guess I'd say that what's happening is that when the inner pistons are in their bore the resistance to initial movement is greater than the resistance of the seals in the bleed screws, so fluid pushes past them. When the pistons are started out of their bores then the resistance of the seals is slightly greater than that of the piston, so the piston moves.
And whatever the position of the pistons in their respective bores, moving both at the same time is always a greater resistance than the seals in the bleed screws.
Ok, bleed port on the lever is leaking, so at least that's one (maybe the) fault found. Which is something of a relief.
I'll fix that, then see if the pistons start behaving.