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Old 10-02-06, 01:10 AM   #1
the beef
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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.
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Old 10-02-06, 04:27 AM   #2
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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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Old 10-02-06, 05:00 AM   #3
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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.
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Old 10-02-06, 07:18 AM   #4
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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.
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Old 10-02-06, 09:51 AM   #5
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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?
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Old 10-03-06, 07:25 AM   #6
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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
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Old 10-03-06, 08:45 AM   #7
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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!
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Old 10-03-06, 09:42 AM   #8
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You could always use a Helicoil on that block if it is stripped. Check with another screw first.
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Old 10-03-06, 09:58 AM   #9
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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.
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Old 10-03-06, 10:10 AM   #10
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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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