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  1. #1
    In Memory of One Cool Cat Blackberry's Avatar
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    Phantom Sounds--Disc Brakes

    I'm having an interesting experience with my disc brakes. Sometimes, for no easily apparent reason, they often make a kind of scraping sound. If I re-adjust the wheel and quick release, it sometimes goes away--or sometimes it turns into a kind of cat-like howl. Then if I go through the process of undoing the quick release, putting the wheel back in the dropout and tightening the quick release, the sound may go away. There must be a more intelligent way to solve this than by my half-assed trial and error method. By the way, they are Magura Julie's. In the stopping power department, they've been fine.

    Thanks for your help!
    Dead last finish is better than did not finish and infinitely better than did not start.

  2. #2
    Senior Member geeklpc1985's Avatar
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    Well, I just have a problem like that, the pad was rubbing, I think. If you have a little knob on the side of the brake, turn it intill it stops, BUT this will cause your brake to be a little softer.

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  3. #3
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    are they wet when they make noise?
    mine make a scraping noise when some water is able to "stick" in the space between the pad and disc
    i don't know enough science to exactly know why this is so, but the brakes don't rub and don't make a noise in any other conditions

  4. #4
    Senior Member Retro Grouch's Avatar
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    What are you using for a quick release? There are different styles and they aren't all created equal. I'd recommend trying a genuine Shimano quick release or a Salsa Flip Off if you want to get fancy and see if that holds your wheel more rigidly.

  5. #5
    In Memory of One Cool Cat Blackberry's Avatar
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    Quote Originally Posted by Retro Grouch
    What are you using for a quick release? There are different styles and they aren't all created equal. I'd recommend trying a genuine Shimano quick release or a Salsa Flip Off if you want to get fancy and see if that holds your wheel more rigidly.
    Interesting point. I'm using what came with the bike--but if I tighten the quick release extra firmly, the squeeling does tend to get worse. I've got the Salsa's on another bike. Will see if it works and let you know.
    Dead last finish is better than did not finish and infinitely better than did not start.

  6. #6
    Senior Member mtbikerinpa's Avatar
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    A flashlight is a handy device for this. Shine it through the caliper while you look through from the other side. There should be a minor but constant clearance as the wheel spins(do it slowly). When you tighten your skewers, have the bike upside down and lean straght down on the wheel to place pressure on the axle to keep it seated in the dropouts. Sometimes the action of pushing the QR can drift the axle over. If there is no clearance when you do this, then readjust your caliper so that you have equal clearance on both sides. Then the wheel and caliper are set to a reproducible standard.
    Aviation Mechanic, Bike racer, Fitness Equipment Restorer

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