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Thread: Source for plastic inserts of dura ace 7700 brake calipers?

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    Default Source for plastic inserts of dura ace 7700 brake calipers?

    Hi all,
    I purchased a pair of BR7700 calipers on eBay. The plastic threads for the cable tension adjuster inserts are partially stripped. They still hold when I take tension off the cable by opening the quick release before turning. However, would love to find a replacement pair of inserts. Any idea for a source of these? I have looked all over without success. I also tried BR5600 /BR6600 inserts but they are not the same system.

    Thanks for any ideas!
    Jonathan
     

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    Default Re: Source for plastic inserts of dura ace 7700 brake calipers?

    Quote Originally Posted by Jc031699 View Post
    Hi all,
    I purchased a pair of BR7700 calipers on eBay. The plastic threads for the cable tension adjuster inserts are partially stripped. They still hold when I take tension off the cable by opening the quick release before turning. However, would love to find a replacement pair of inserts. Any idea for a source of these? I have looked all over without success. I also tried BR5600 /BR6600 inserts but they are not the same system.

    Thanks for any ideas!
    Jonathan
    If I recall correctly these are 7700 only, you best bet is unfortunately finding another brakeset to scavenge. Shimano hasn't made these parts in many years.

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    Default Re: Source for plastic inserts of dura ace 7700 brake calipers?

    Quote Originally Posted by SignatureJustin View Post
    If I recall correctly these are 7700 only, you best bet is unfortunately finding another brakeset to scavenge. Shimano hasn't made these parts in many years.
    Bummer... Lucky the inserts still hold passively, I suppose.
    Any good way that anyone knows to repair partially stripped plastic threads like these?
     

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    Default Re: Source for plastic inserts of dura ace 7700 brake calipers?

    Pardon me, but I don't think 7700 calipers have threaded plastic inserts. Mine seem to have a male threaded barrel, a sort of X shaped nut, and a plastic insert that keeps the barrel from turning when the nut is turned. Is the nut missing? Has the barrel tapped threads in the plastic insert to simulate the function of the complete adjuster?
     

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    Default Re: Source for plastic inserts of dura ace 7700 brake calipers?

    Quote Originally Posted by See View Post
    Pardon me, but I don't think 7700 calipers have threaded plastic inserts. Mine seem to have a male threaded barrel, a sort of X shaped nut, and a plastic insert that keeps the barrel from turning when the nut is turned. Is the nut missing? Has the barrel tapped threads in the plastic insert to simulate the function of the complete adjuster?
    AHA! OK that is what's going on.

    http://techdocs.shimano.com/media/te...9830605105.pdf

    Makes sense now. I think the star nut must be locked at its highest point on the barrel, and I was confused in thinking that the nut and the barrel are a single turning unit. I will look at it closely when I get home in a couple of hours. Thank you so much- I will update soon.
     

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    Default Re: Source for plastic inserts of dura ace 7700 brake calipers?

    Quote Originally Posted by Jc031699 View Post
    AHA! OK that is what's going on.

    http://techdocs.shimano.com/media/te...9830605105.pdf

    Makes sense now. I think the star nut must be locked at its highest point on the barrel, and I was confused in thinking that the nut and the barrel are a single turning unit. I will look at it closely when I get home in a couple of hours. Thank you so much- I will update soon.
    Ah HA!

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    Default Re: Source for plastic inserts of dura ace 7700 brake calipers?

    OK- got the star nut loosened and working. The barrel is just a little wobbly in the now-threaded plastic sleeve, but not a problem! Thanks to See for your close reading of what I said!!

    Love this place-
    Jonathan
     

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    Default Re: Source for plastic inserts of dura ace 7700 brake calipers?

    That's another good reason why I always stress my assistants that all the barrel adjusters must be kept clean and with one drop of oil.
    Sick and tired of seeing mech adjusters, brake adjusters, down-tube adjusters; all seized bend and stuck, therefore useless
    Andrea "Gattonero" Cattolico, head mechanic @Condor Cycles London


    "Caron, non ti crucciare:
    vuolsi così colà dove si puote
    ciò che si vuole, e più non dimandare"

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    Default Re: Source for plastic inserts of dura ace 7700 brake calipers?

    How true!

    Unfortunately, this was a case of the prior user not using them correctly, compounded by my subsequent stupidity and ignorance. Which underscores the importance of education by an expert mechanic!
     

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