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Old 11-18-09, 06:12 AM   #1
kernix
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My brakes squeak, LOUDLY?

I took my bike in to have the drive chain replaced and they said they would put on brakes for a nominal fee. Since then, the day after it rains my brakes squeak and I do not know why. Anyone know why this is and what I can do to stop it?

Thanks!
Jim
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Old 11-18-09, 06:44 AM   #2
dabac
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Type of brakes would be helpful....
Rim brakes often squeal if they aren't toed in, disc brakes can squeal when wet.
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Old 11-18-09, 07:13 AM   #3
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Type of brakes would be helpful....
Rim brakes often squeal if they aren't toed in, disc brakes can squeal when wet.
Make and type of the new brake pads or shoes would also be useful information.
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Old 11-18-09, 07:48 AM   #4
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Make sure the rims are clean. Also, turn up the stereo and I'm sure it won't squeal as bad.
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Old 11-18-09, 08:50 AM   #5
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Squealing/Squeaking

Squealing brakes is a common problem, and there's no one simple solution to it.
It's caused by the friction of the brakes against the rim flexing the brake arms, which then slip back, grab, slip back, grab, etc. This process happens at such high speed that it often causes an audible vibration.
All brakes do this, but with luck the pitch (frequency) is too high for human hearing.
This is generally annoying, but not a safety issue. Unlike automotive brakes, bicycle brakes that squeal are usually in good functional condition.
Here are some things to try if your brakes squeal:
    • <LI class=MsoNormal style="mso-list: l0 level2 lfo1; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto">"Toe in" the brake shoes, so that the front edge of the shoe hits the rim slightly before the rear edge. Not all brake systems permit this type of adjustment, but most do. <LI class=MsoNormal style="mso-list: l0 level2 lfo1; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto">Clean the rims with a good, oil-free solvent (citrus, alcohol, something like that.) <LI class=MsoNormal style="mso-list: l0 level2 lfo1; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto">If the pivots of your brakes are adjustable, make sure that you've eliminated as much play as possible without causing them to bind. <LI class=MsoNormal style="mso-list: l0 level2 lfo1; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto">Different brake shoes may help. I particularly recommend Kool Stop salmon colored units.
    • A "brake booster" may help. This is a horseshoe-shaped arch that connects the two cantilever bolts together, making the whole system more rigid
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Old 11-20-09, 12:41 PM   #6
kernix
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Thanks everyone.
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