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My bike's Dura-Ace R9120 rear-brake/front derailleur shifter (left shifter in UK) leaks brake fluid when I pull hard on the lever. It leaks from this specific place:

Location of leak

Gif demonstrating the lever leaking

I understand this lever is mechanically identical to Ultegra R8020, and have found a couple of forum posts on other sites covering people's fixes, but these levers either leak from a different location, or the fix doesn't work e.g.

I have replaced the diaphragm and re-bled the brakes (this part: https://www.sjscycles.co.uk/gear-spares/shimano-duraace-str9120-lid-unit-left-y0c598030/). The lever is firm and works well, but if I pull hard on the lever it leaks.

Is this lever repairable?

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    just wondered if you ever fixed this issue, as exactly the same thing has happened to mine!
    – Adam Walker
    Nov 6, 2022 at 16:53
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    Sadly not. I think it's a known issue that would result in a new lever if you still have warranty. I ended up buying a used one that so far seems OK - not cheap, obviously!
    – Paul Suart
    Nov 6, 2022 at 20:33
  • I wonder if there's a recall for this model of lever, have you tried looking on Shimano's site/Google, or spoken to your local bike shop (ideally one which is an Authorised Shimano Service center??) hope that helps Dan
    – Munkeh72
    Jan 19 at 11:51

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