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  • it is routinely stored upright

    It can do sometimes, air from the top of the reservoir might make it's way into the line if it's upright, usually pumping the lever a lot will sort it, if not try the burping trick I mentioned, if you've not got the kit then just just undo the lever bleed port and try pumping the lever a little carefully and tapping the hose, you can drop a few drops at a time of fluid in if you can't see any in there. You can stop it happening again by whacking some straps or similar round the pulled levers when storing upright, although usually a good bleed is enough to avoid needing to do that until the pads get pretty worn.

  • Thanks again for the help.

    I managed to burp/lever bleed yesterday and got lots of air out (20+ small bubbles) and topped up the fluid as well. Feels much better.

    On closer inspection I think oil has been leaking from where the hydraulic line enters the caliper. I've nipped up that connection so hopefully that might solve it ? Is there a good way to monitor that?

  • Just have a look where the oil is leaking as soon as pressure is lost.
    If it's the connection it may be a badly installed olive.

  • Do check the caliper body for bulges or cracking, could happen due to overtightened compression nut.

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