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  1. #1
    mtbr member
    Join Date
    Apr 2004

    New question here. Shimano Deore disc experts please - urgent, please help


    Ive undone the wrong bolts on my deore disc front end, in an attempt to adjust the caliper so its straight.

    now ive undone these bolts and done them up again my brakes are extremely weak, and barely work at all. do these bolts hold pressure? does that mean i need to re-bleed? i cant find anything in the shimano docs about these bolts (obviously because you are not supposed to touch them )

    can i fix this today and go riding, or does the shop need to bleed them

    note i am dubious about undoing them again, as they are very tight and ive pretty much chewed the bolts. is there a reasonably simple fix for this?
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    Last edited by intro123; 04-03-2004 at 02:08 PM.

  2. #2
    Are you talking to me?
    Reputation: damion's Avatar
    Join Date
    Jun 2003

    Take it to the shop.

    Did tha caliper leak? There is a seal there. There is a good chance that something was damaged. For peace of mind, take the bike to a good shop that has done lots of disc brake work.

  3. #3
    mtbr member
    Join Date
    Apr 2004
    im pretty sure it didnt leak, theres no fluid anywhere.

    im sure that means they are fixable

    i didnt undo them the whole way, just loosened them off

  4. #4
    mtbr member
    Join Date
    Apr 2004
    so if ive got a bit of air in the system, could i just undo the top resovoir, and pull the lever a few times to bring the air to the top?

    surely that will work ?

    im asking because the bike shop is several hours away

    edit : moved the lever so it was at the top and level, pumped it about 20 times and now its stopping again! it pulls a bit closer to the handlebar now though.... i guess that means it might have a little airbubble in there?
    Last edited by intro123; 04-03-2004 at 04:08 PM.

  5. #5
    mtbr member
    Reputation: Schtoojp's Avatar
    Join Date
    Mar 2004
    Yep, you got air in there! Even cracking the seal is enough to let the fluid (under pressure) leak a little (not visible) fluid and be replaced with air.

    Best solution would be to replace the bolts and re-bleed the brake. Now that the seal has been compromised, there's little garantee that it will remain sealed. You may have sucked in some dirt too which could chew up the pistons. And the fact that the bolts are no longer healthy may mean the tension on them is no longer correct and they may loosen up and you could loose brake line pressure. This is not a bad thing, it is a catastrophic thing.

    Not trying to be a doomsayer, but they are brakes and should be at their best at all times. Better to go to the trouble to make sure they are right than to find out they are not right at the bottom of a large hill...

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