Shimano XT hydros stuck piston?- Mtbr.com
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  1. #1
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    Shimano XT hydros stuck piston?

    Have some 775 XT hydros that have worked fine til yesterday when I went to go ride and when I pull the rear lever the pistons won't retract unless I push them apart with something.

    Nothing has changed except it getting colder out but the front works fine...

    Is there an easy (or tough, whatever) fix for this? Thanks, all.

  2. #2
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    You probably need to bleed them and clean the pistons. It's not a huge deal if you follow instructions carefully and have/can get the appropriate tools.

    See here:
    http://forums.mtbr.com/showpost.php?...6&postcount=22

    and here (this is the guide I used)
    http://www.nsmb.com/gear/shimano_bra...vice_03_08.php

    I saw this on pinkbike the other day as well, super useful.
    http://www.pinkbike.com/news/tech-tu...ment-2010.html
    http://www.pinkbike.com/news/technic...leed-2010.html

  3. #3
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    There are a lot of posts on the cold temp problem with these brakes.
    http://http://www.mtbr.com/cat/brake...0_1507crx.aspx

  4. #4
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    Quote Originally Posted by Johnny K
    Have some 775 XT hydros that have worked fine til yesterday when I went to go ride and when I pull the rear lever the pistons won't retract unless I push them apart with something.

    Nothing has changed except it getting colder out but the front works fine...

    Is there an easy (or tough, whatever) fix for this? Thanks, all.

    Geez guys it is a sticky piston.

    Wash the bike and brake.

    Remove the wheel.

    Remove the pads.

    Get a pair of pliers and hold the moving piston push the stuck piston out and clean with Isoprpyl alcohol.

    Make sure it is moving properly add a dab of teflon lube.

    Do the other side.

    Reassemble and ride.

  5. #5
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    Except use brake fluid (Shimano only) to lube the piston.
    "It looks flexy"

  6. #6
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    Or Magura blood. Same thing. Both are mineral oil of the same viscosity.
    My name is Chris and I ride a Prophet 650b with a Lefty.

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