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Brake Positioning Issue

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Old 07-22-13 | 12:28 PM
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Brake Positioning Issue

I had to remove my gf's front wheel and when I put it back on, the front brake is now sitting a little cock-eyed and I'm not sure how to adjust it.

here's a quick 0:43 video to help explain the issue: https://www.youtube.com/watch?v=FNaEo...ature=youtu.be

Any resources or help would be appreciated!

thanks!
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Old 07-22-13 | 12:46 PM
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That brake caliper is loose, the brake cable housing is pushing it off center. Apply the brake lever, and at the same time tighten the brake nut on the back of the fork. It's probably recessed and will need a 5mm allen wrench. Check centering by applying the brake slowly and see if the pads cause the rim(you're looking at the tire at this point) to go slightly off center. If this happens, grab the brake caliper and adjust it slightly. Done.
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Old 07-22-13 | 12:48 PM
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I would loosen the brake mounting bolt on the back of the crown of the fork, will probably be a 4 or 5 mm allen head. Then I would make SURE the front wheel is centered in the fork, then apply the front brake lever fairly tightly while tightening the brake mounting bolt. This should get you close, then use the little bolt (probably 2 1/2 or 3 mm) in the top of the caliper arm to micro-adjust the brakes to perfectly centered.

Good luck!
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Old 07-22-13 | 01:57 PM
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All fixed! Thanks for the quick responses!
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Old 07-22-13 | 04:20 PM
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Originally Posted by gizzsdad
I would loosen the brake mounting nut on the back of the crown of the fork, will probably be a 4 or 5 mm allen head. Then I would make SURE the front wheel is centered in the fork, then apply the front brake lever fairly tightly while tightening the brake mounting nut. This should get you close, then use the little bolt (probably 2 1/2 or 3 mm) in the top of the caliper arm to micro-adjust the brakes to perfectly centered.

Good luck!
FTFY. This will work as well, the only difference is using the adjuster bolt or doing it manually.
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Old 07-22-13 | 07:22 PM
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Originally Posted by gizzsdad
This should get you close, then use the little bolt (probably 2 1/2 or 3 mm) in the top of the caliper arm to micro-adjust the brakes to perfectly centered.
IMO that little bolt is pretty useless; I just adjust it once so the brake looks nicest, and centre the caliper by hand. Star washers between the caliper and frame are pointless too IMO; they only damage the paint. The mounting nut doesn't need to be super-tight; I've always done it up tight enough for the brake to stay put, and loose enough to manually centre the brake, and I've never had a problem.

Also, with a dual-pivot, perfectly centred isn't perfectly centred: if you have the same gap between pad and rim on each side, you'll find one side hits the rim first, pushing it to one side, and you can feel this through the lever. I centre the brakes by ensuring both pads hit the rim at the same time.

DPs are easily centred by hand; I've found the best method is with your thumbs under the pads and a couple of fingers of each hand resting on top near the mounting bolt. Pull the brake open with your thumbs, biasing to the direction you want to move it.
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