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My problem, I have a complete M7000 (MTB) brake set that uses SM-BH90-SB hose, and now I want to connect a 105er BR-R7070 brake caliper that needs SM-BH90-JK-SSR or SM-BH90-J-SSR hose.

Are the two hoses compatible? I am aware that BH90-SB uses a banjo connector, obviously that need to go. Can I just cut it off, fix the pin and olive and connect it to the R7070? Anybody here done that?

PS: can pins/olives be reused (just in case I can get them out)?

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Are the two hoses compatible?

Judging from related questions and my experience, Shimano hoses are interchangeable (same for calipers) and most people won't notice the difference without dedicated comparison procedure.

I am aware that BH90-SB uses a banjo connector, obviously that need to go. Can I just cut it off, fix the pin and olive and connect it to the R7070?

Yes, that will be enough. You should be able to use standard Shimano caliper inline furniture(page 13).

Just in case, R7000/R8000/R9100 series hydro shifter require special flanged bolt.

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