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My caliper rotor push oil back in the STI. All of the sudden mineral oil started leaking.

Do you know SKU of this part?

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    If you lift up the rubber "skirt" around the handlebar clamp, there will be a part number embossed into the plastic. This will be the part number for the whole shifter, probably something of the format "ST-7100" Please find that and then we can find maintenance manuals for this specific item. I'm guessing it will be a "ST-7020R" – Criggie Feb 14 at 8:13
  • Also - have you used anything but mineral oil in this brake ? – Criggie Feb 14 at 8:22
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    Did you try to re-assemble and re-bleed the brakes? Master cylinder should not leak when pistons are fully retracted. The diaphragm from the second photo looks OK and I have hard time imaging how extra pressure would damage it. This is not something I personally experienced, but maybe the system simply had too much brake fluid in it. – Klaster_1 Feb 14 at 8:41
  • @Klaster_1 You can pop them with egregious overfilling, but yea, that doesn’t look to be the case here. – MaplePanda Feb 14 at 8:44
  • The rubber bladder got a hole by resetting the pistons. And that sucks its a super sensitive part of the lever and it's not w replaceable. – Romualdo Ducon Feb 17 at 12:09
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According to the ST-7020R exploded diagram at https://dassets.shimano.com/content/dam/global/cg1SHICCycling/final/ev/ev/EV-ST-R7020-4341C.pdf

That part doesn't exist as a removable part, hence why you need to confirm your exact shifter part number.

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For completeness - the dealer manual is at https://si.shimano.com/api/publish/storage/pdf/en/dm/RADBR01/DM-RADBR01-07-ENG.pdf and a browse through shows no mention of removing that plate.

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The sad part is. That part is not replaceable. Ots not that tough when you push ur piston. That reservoir will pop and mineral oil start leaking.. i believe that it should be a replaceable. No information what so ever you will need to replace the whole shifter itself

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