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XT M8100 brake diaphragm

PB Forum :: Shimano
XT M8100 brake diaphragm

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flag matyk
Posted: May 7, 2022 at 3:37 Quote
I ruptured the diaphragm in the lever master cylinder trying to get stubborn air out of the system. Does anyone know if you can but just the rubber diaphragm anywhere? I really don't want to spend $100 on a whole new lever, and I'm not sure I want to trust my Flex Seal "repair."
flag M0rd4c4i
Posted: Jul 7, 2022 at 6:46 Quote
I had to Google round for this and I'm sorry to say that it's not a part that they have available for sale.
flag kiranseligman
O+
Posted: Jul 8, 2022 at 21:46 Quote
mrkumro wrote:
I ruptured the diaphragm in the lever master cylinder trying to get stubborn air out of the system. Does anyone know if you can but just the rubber diaphragm anywhere? I really don't want to spend $100 on a whole new lever, and I'm not sure I want to trust my Flex Seal "repair."


Best thing I can think of is maybe call Shimano and see if you can get it or maybe buy a used brake set if it’s cheaper and Just steal the diaphragm.
flag Trinimon
O+
Posted: Jun 19, 2023 at 5:57 Quote
Shimano now sells the diaphragm but I've yet to see any store sell them other than AliExpress. If you are in a pinch, remove the ruptured diaphragm and clean it thoroughly in 90% isopropyl then carefully dab some Gorilla super glue to seal the rupture. I've managed to ride it for a few rides until the one I ordered off AliExpress arrived.

The only shop that had it on Aliexpress charged $20 shipping!! For $40 more I could have bought a full lever/master cylinder but unfortunately those were during the covid shortages.
flag diabsoule
Posted: May 1, 2024 at 5:34 Quote
Although this is an old comment NSMB.com recently had an article about this. They had success with using a small amount of rubber cement to plug the rupture. Also a full detailing of getting it in/out.
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