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Shimano 105 Hydro Shifter Crack

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Shimano 105 Hydro Shifter Crack

Old 05-07-21, 05:10 PM
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jponio
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Shimano 105 Hydro Shifter Crack

I was trimming my hydro brake hoses because I trimmed my steerer tube and I ended up cracking the right shifter where the hose goes into the shifter. I can't post pics because i'm under 10 posts. It looks like the one in the link below, just not as large. (the stars below are r e d d i t without the spaces) ******.com/r/bikewrench/comments/i2thq1/shimano_str7020_what_caused_this_crack/

I confirmed there is only one olive in there. It doesn't appear to be leaking as I think the hose is tightly fitted. Just curious if anyone has seen these fully fail due to this. The crack is just along the top half, not the bottom half.

With this COVID world we live in, Shimano parts are impossible to find. As long as there aren't any leaks and I can put some epoxy across the top part of the crack for extra support, do you think it would be safe to run this for a while until parts are available? LBS have told me they don't have any availability and no ETA on when they will be back in stock.

Thanks in advance!
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Old 05-07-21, 05:22 PM
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I'm no hydraulic brake expert but have had some ski and bike exposure to epoxies. IME epoxy is not a structural material. It binds stuff that are though. It it your thought that the crack would have less likelihood to expand with an epoxy cap over it? If so without any added material that has some real tensile strength, I doubt it. Andy
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Old 05-07-21, 05:25 PM
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Originally Posted by Andrew R Stewart View Post
I'm no hydraulic brake expert but have had some ski and bike exposure to epoxies. IME epoxy is not a structural material. It binds stuff that are though. It it your thought that the crack would have less likelihood to expand with an epoxy cap over it? If so without any added material that has some real tensile strength, I doubt it. Andy
Thanks for your input. That was my thought. While depressing the lever the Crack doesn't seem to expand, just wanting to add some sort of support to the weakend area. Any thoughts on something that could add a little support short of replacement?
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Old 05-07-21, 05:36 PM
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Originally Posted by jponio View Post
Thanks for your input. That was my thought. While depressing the lever the Crack doesn't seem to expand, just wanting to add some sort of support to the weakend area. Any thoughts on something that could add a little support short of replacement?
I suppose one could add a few layers of a fiber (carbon being the trendy one) with epoxy binder about/around the lever body. But the body has a pretty complex surface and avoiding the critical surface features might prove challenging. Then there's the aspect of adhesion top the body's material and somehow having zero fluid beneath the fiber patch/surrounding band. This is beyond my skill set... Andy
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Old 05-07-21, 06:51 PM
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Try contacting Shimano. A longshot but they may offer to help you out. This seems to crop up with their hydro brake/shifters more often than it should.
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