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  1. #1
    100% USDA certified the beef's Avatar
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    Brake cable clamp bolt - stripped?! (picto-diagram)

    Today I was readjusting the clearance of my Tektro caliper road brakes after receiving a new wheelset. My friend was tightening the bolt for me while I pulled the cable down; however, he was a little overenthusiastic and turned the allen key probably a half turn too much. When I backed it off and tried to tighten it again after an adjustment, it just turned without threading. (Ah, crap.)

    So I took the bolt out, and yes, the threads looked wonky. However, my question is whether it's the just bolt threads that got stripped or if the clamp block may have been stripped or damaged too (I'm worried). A diagram:



    I'm taking it to the bike shop today. The thing that had me stressed was: if the block got damaged, how will I manage to replace it? Do shops sell that little quick release piece with that clamp block atached? Will I have to buy a whole new brake (eek)? Will I most likely have to only grab a new bolt?

    Thanks, guys.

  2. #2
    The Improbable Bulk Little Darwin's Avatar
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    Sometimes the obvious gets missed...

    Have you tried the bolt from your other brake to see if it works?

    If it works, then replacing the bolt is all that is needed, if it doesn't work then go the next step.

    EDIT: Short answer, it is possible to damage the bolt without damaging the nut...
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  3. #3
    LF for the accentdeprived
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    I'm afraid the block is softer material than the bolt, so it's likely to be stripped. If all else fails, you can more than likely have the block tapped to a larger size. It's prolly M5, make it M6. Drill or file the washer if needed.
    Quote Originally Posted by dutret
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  4. #4
    cab horn
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    No point guessing, try swapping over some other bolt you have and see if it threads (preferably the one you are not using on your other brake).

    I stripped the bolt last time I was tightening that down, it wasn't the threads on the actual caliper, just the bolt.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  5. #5
    100% USDA certified the beef's Avatar
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    Ah, duh. I'll check it as soon as I get home today.

    What would I do if the block was stripped as well? Would I have to replace the whole caliper, or do they sell that part?

  6. #6
    ot.net slave
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    just put a nut on the other side, and use a longer bolt. No problems. And not particularly visually intrusive. Don't take the risk with damaged threads, in aluminium, on a brake. Please no.

    - Joel

  7. #7
    Senior Member Morgie's Avatar
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    Quote Originally Posted by the beef
    Today I was readjusting the clearance of my Tektro caliper road brakes after receiving a new wheelset. My friend was tightening the bolt for me while I pulled the cable down; however, he was a little overenthusiastic and turned the allen key probably a half turn too much. When I backed it off and tried to tighten it again after an adjustment, it just turned without threading. (Ah, crap.)

    So I took the bolt out, and yes, the threads looked wonky. However, my question is whether it's the just bolt threads that got stripped or if the clamp block may have been stripped or damaged too (I'm worried). A diagram:



    I'm taking it to the bike shop today. The thing that had me stressed was: if the block got damaged, how will I manage to replace it? Do shops sell that little quick release piece with that clamp block atached? Will I have to buy a whole new brake (eek)? Will I most likely have to only grab a new bolt?

    Thanks, guys.

    Mad skills with the diagram man!

  8. #8
    Non Tribuo Anus Rodentum and off to the next adventure (RIP) Stacey's Avatar
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    You could always use a Helicoil on that block if it is stripped. Check with another screw first.

  9. #9
    ride, paint, ride simplify's Avatar
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    Quote Originally Posted by tomacropod
    just put a nut on the other side, and use a longer bolt. No problems. And not particularly visually intrusive. Don't take the risk with damaged threads, in aluminium, on a brake. Please no.

    - Joel
    What a great idea. Simple, and absolutely secure.
    No car. No TV. Three bikes.

  10. #10
    Electrical Hazard
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    dang. MSPAINT 4 LYFE

    I agree with the putting a nut on the other side of the block. Make it a Nyloc one.
    ..and of course, get a bolt thats a few mm longer.

    $1.50 at the hardware store and you're golden.

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