wheel rub with disc brakes- Mtbr.com
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  1. #1
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    Reputation: vieuphoria's Avatar
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    wheel rub with disc brakes

    disclaimer: I'm a total noob to mountain bikes

    the front disc rotor keeps rubbing the brake pads (avid 5 juicy) even though the wheel appears true

    the brake tabs seem to be set to the maximum possible width, but I also don't see a way to adjust them

    it could be a slight imperfection; will the trueness of the wheel affect the spin of the disc rotor? I'm trying to avoid a costly shop visit if I can (the local wrenches are elite..ist)

  2. #2
    What day are we riding?
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    Trueness of the rim has nothing to do with your issue. The rotor is mounted to the hub. Check your quickreleases first.

  3. #3
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    Two possibilities:

    1: rotors are slightly bent (common), bend them straight (be patient) and if you used your hands be sure to clean rotor when done.

    2: brakes were installed incorrectly / imprecisely, get tech docs and redo.

  4. #4
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    disc rotors are very rarely true. the generally need a massaging to not rub. be gentle and be patient and you should be able to get it pretty straight.

  5. #5
    Out spokin'
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    Do this

    Quote Originally Posted by vieuphoria
    ...
    the brake tabs seem to be set to the maximum possible width, but I also don't see a way to adjust them...
    Loosen the caliper fixing bolts that attach the caliper to the fork/frame adapter. Don't pull them all the way out, just loosen them a little so the caliper can move back and forth over the rotor. Then grasp the brake lever and squeeze it to put the brake on. Now tighten the fixing bolts back up.

    This will center the caliper over the rotor. BUT... if your rotor is not running true, you should true it before you do the caliper reinstall as I've described above.

    Here is the order of things:
    1. Make sure your wheel is settled into the dropouts and QR is secure.
    2. True brake rotor
    3. Reinstall caliper

    You'll be golden.

    --Sparty
    disciplesofdirt.org

    We don't quit riding because we get old.
    We get old because we quit riding.

  6. #6
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    thanks for all the info

    a buddy came over and showed me the business card trick

    he loosened the caliper, stuck a business card on each side of the rotor, and retightened

    a quick spin around the parking lot seemed fine, but the guy I just sold it to will find out for sure

  7. #7
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by vieuphoria
    thanks for all the info

    a buddy came over and showed me the business card trick

    he loosened the caliper, stuck a business card on each side of the rotor, and retightened

    a quick spin around the parking lot seemed fine, but the guy I just sold it to will find out for sure
    The "business card trick" is useless. Hydro brakes are self adjusting and the pads will return to the closer position after a few stops.
    mtbtires.com
    The trouble with common sense is it is no longer common

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