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Push fluid both ways until it works, can also leave the cup on and tie the lever down for a few hours, make the lever higher than caliper, tap everything a few times, repeatedly squeeze lever before and after. My guess would be a bubble caught behind the pistons, so if that doesn't work, or maybe beforehand, remove the bleed block (put it back afterwards) and squeeze the lever a few times so the pistons come out (not too far) then push fluid one way or the other. Sometimes pulling on the syringe (don't use a bag, it's wasteful and you can't go both ways) at the caliper or lever with the lever pulled will pull out a stubborn bubble.
snottyotter
Having issues with a Shimano XT front brake, new, not biting well.
Fitted new XT 4 pots, back is fine, front will not get tight.
Bled it a few times, no air bubble that I can find.
Before I just buy another one, any ideas?
Would replacing olives and hose inserts make any difference?
Hose is not kinked or damaged.
Cannot see any fluid leaking out.
It is infuriating.
Edit: just read up thread about caliper fed fluid, will try that over the weekend.