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  1. #1
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    Shortening hose on Shimano XT BR-M785

    Hey everyone,

    I recently ordered a pair of XTs (BR-M785), pre-bled and the hoses are way too long.

    I followed this guide from the Schimano site, and cut the hose to install the rear brake. Then, installed the brakes.

    The problem I'm having is that there is that the brake levers hardly actuate the pads so that it is pretty much ineffective. They were working fine before I cut the hose.

    I'm guessing that maybe I let some air in the lines, though I did follow the instructions on their site exactly.

    Any ideas on what to do (besides taking it into an LBS)? I'd like to at least figure out how I botched the job. I'm holding off on the front brake installation for now.

    One thing missing from the guide: I'm guessing that the olive will crimps onto the hose when you tighten up the connecting bolt on the lever.

    Thanks!

  2. #2
    Plays with tools
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    You've got air in your system and need to bleed them.

  3. #3
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    Ah, so I suspected. Thanks!

  4. #4
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    If the OP followed the directions exactly, then what would've caused this issue? Asking because I'll be doing the same installation real soon, and will need to cut my hoses to desired length as well.

  5. #5
    El CicloPath!!!!!!!
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    Air can enter the system when you are cuttig the line. You resally need to hold them vertical and use a very sharp cutting instrument or line cutter and make the cut square and clean.
    It is possible that air got into the line at the part of the hose that is cut. Just a few bubbles of air will do it. Also, when installing the new olive, be very careful and make sure it is straight and apply even pressure when screwing down the bolt.

    Once everything is back in place, tightened up, you also need to give the lever a few hard sustained squeezes; make sure that everything gets fully seated. If after that, you still have a soggy lever, then you will need to have to rebleed. Fortunately, its not that difficult with the Shimanos.

  6. #6
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    Do Not Squeeze the levers while the hose is disconnected from the levers.

  7. #7
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    Quote Originally Posted by Lemonaid View Post
    Do Not Squeeze the levers while the hose is disconnected from the levers.
    I've found that if I squeeze the lever ever so slightly when I'm inserting the line and keep it squeezed until the connection is secure that it will pull any air in the line into the master cylinder and into the reservoir. It's worked for me for years on hundreds of trimmed lines.

  8. #8
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    It's always a good idea to bleed your system when cutting lines. By the sound of your situation, you ended up with air in the line. The nice thing is that the 785 brakes are so easy to bleed.

    Sent from my SGH-M919 using Tapatalk 4 Beta

  9. #9
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    I just cut and re fitted my hoses with new barb and olive . No bleeding or anything . So of simple I found it hard to believe . I did them in situ as well .

  10. #10
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    Quote Originally Posted by crazee horse View Post
    I did them in situ as well .
    Ballzy.

    I like to pull 1 pad and stick a butter knife in there, then lock the brakes down on the knife. Then cut. When i reset the pads i push the fluid back into the MC, along with any air bubble i introduced. Has worked well.
    .

  11. #11
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    As easy as the SLX, XT, XTR brakes are to bleed, I just cut my hoses and did all of the work without a care in the world. After I was done, I attached the Shimano funnel to the master cylinder and bled away like any other hydro system I have ever done since I was a kid.

    I am a bit of a perfectionist, so I did each brake about 12 times even though there were no more signs of air after the 3rd bleed. Took about 3 minutes per wheel.

    I will never own a Sram brake until they can figure out the bleeding process.
    Last edited by D Bone; 2 Weeks Ago at 09:07 AM.

  12. #12
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    Extend the pistons out a bit. Disconnect and cut hose, then reinstall to lever. push pistons back into caliper this will force any small air bubble up to the reservoir. Done.

    Although I usually do a full bleed afterwards anyway since you don't know how long the fluid has been in storage in the new brakeset. It only takes a few more minutes.

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