• You're right. Must have been a shit set up in the first place. Wouldn't be the first time.
    After reading your comments I went back and checked the size of old and new inserts. Thankfully both are 2.1mm. There's no mix and match here. More luck than sense.
    I've also checked shimano product page. As long as you get sm-bh90-xxx hose it'll work just fine with deore. For higher models you have to check the last 3 letters in the hose code. They specify the banjo, and banjo bolt type. Deore have straight connectors on both ends so you can just chop off the bonjo.
    I've learned more about disc brakes today than I intend. Thanks.

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