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disc brake noises

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Old 10-20-09, 08:52 AM
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Japan
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disc brake noises

Hey all
My first time with disc brakes. The front brake makes a low, even hiss when I give it a lot of pressure to stop. The back one, though, makes something between a hiss and an rhythmic low chirping/grinding sound. I "wiggle" tested for obvious loose pieces, but everything is solid. Internal stuff, don't know. What's the likely culprit, and how can I fix it? loose brake pad?
Also, I notice a bit of contact while riding sometimes, possible from both front and back, not enough to slow the bike, but enough to make some slight whisking noise. Is this normal?
thanks!
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Old 10-20-09, 01:21 PM
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Darth_Firebolt
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what brand/ model brakes are they? what kind of bike are they on?
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Old 10-20-09, 08:24 PM
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First time with disc brakes? Are they new? If so, some of the low, hissing and grinding sound is probably the pads breaking in a bit. If you're hearing a rythmic noise while riding you probably need to do a caliper alignment to center the caliper and pads on the rotor. As Darth said, post up the brake model and any other info you can.

Mike
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Old 10-26-09, 10:28 AM
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Sure. Here's the brakes:
http://www.tektro.com/04support/pdf/Auriga-English.pdf

My bike is a GT Avalanche 2.0 2009.
Thanks!
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Old 10-26-09, 02:03 PM
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Check your rear rotor for true (look at it while it spins using the caliper/pads as a guide); they're easy to true up with a small adjustable wrench if they're a bit warped/out of true. Otherwise sounds fairly normal for disk brakes. How much bed in time do they have?
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Old 10-27-09, 09:43 AM
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Thanks
been using them for a few weeks now. Will check alignment again. I take it a bit of cling/clang is standard then for disc brakes?
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Old 10-27-09, 11:12 AM
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The occasional cling clang or zing zing is probably flex influenced (and possibly helped along by an out of true rotor). You might have a bit of a flexy fork, or possibly some play in your hub bearings.
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