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    In the meantime I have learnt that what you wrote is more or less correct. I have also found out that this sort of leak happens quite often. There used to be a solution, which I cannot apply to my brakes, I assume because the Shimano brake design has changed slightly, but I am posting the link to it because it should be applicable to somewhat older models: mtbr.com/threads/2011-xtr-m985-brakes-leaking.750869/…
    – Mick
    Commented Jan 23, 2021 at 15:33
  • Cycling tech is awesome! Nice find.
    – love2phish
    Commented Jan 23, 2021 at 15:46
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    Update to first comment: The solution I linked to actually still works for newest Shimano brakes! Just go to the second page of the linked-to thread to see the photos! I haven't checked that thread for a while so I have not seen them until today. The guy who posted them actually had a punctured diaphragm so he had to replace it, but the photos illustrate the procedure to remove the cap and the diaphragm in order to just reset it.
    – Mick
    Commented Jan 23, 2021 at 15:58