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27-03.-2007, 11:08 AM
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#1 |
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Registered User
Join Date: Mar 2007
Posts: 15
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weight shift from out of saddle pedaling causes disk brakes to rub pads
when out of the saddle and bringing the bike side to side i hear the gentle whisper of a pad rubbing. it should be happening front and back.
bringing my pads out creates alot of brake lever play. does everyone with disks put up with alot of play? i don't see how spoke tension would help b/c the disk is connected to the hub. wheels - mavic crosslink brakes - 8 inch avid somethings, good ones, mechanical any solutions? i'm sure this has happened to many. |
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29-03.-2007, 02:24 AM
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#2 | |
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Registered User
Join Date: Sep 2003
Location: Sweden
Posts: 848
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Re: weight shift from out of saddle pedaling causes disk brakes to rub pads
Quote:
Are you annoyed at the sound or at the lost energy? Disc brakes haven't a lot of clearance, so it doesn't take much for them to rub. If you're worried about the lost energy why not lift a wheel off the ground, spin it up, apply brakes until you've recreated the sound, see what it actually does to slow the wheel down. I don't think you should blame either your wheels or your brakes for this, I think it's the frame/fork that's flexing. It has far more give than the comparatively solid hub / disc assembly. Tighter/ better QR's might help some, but that's assuming the ones you have needs improving. |
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29-03.-2007, 03:13 AM
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#3 |
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Registered User
Join Date: Mar 2007
Posts: 15
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Re: weight shift from out of saddle pedaling causes disk brakes to rub pads
the lost energy and brake wear is what i'm annoyed about.
i'll post a reply when i try the advice above. |
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29-03.-2007, 08:44 PM
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#4 | |
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Registered User
Join Date: Jan 2004
Location: Manchester and South London
Posts: 440
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Re: weight shift from out of saddle pedaling causes disk brakes to rub pads
Quote:
The brake wear as a result of the pads "whispering" against the rotor is negligible. The noise can be irritating but you get used to it and soon stop hearing it. The loss of energy is also negligible. As mentioned above the cause is because of the very small clearence between pad and rotor. What fork are you using? All but the very best forks will tend to have some flex in them. |
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30-03.-2007, 01:09 PM
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#5 |
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Registered User
Join Date: Feb 2007
Location: NE Indiana
Posts: 209
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Re: weight shift from out of saddle pedaling causes disk brakes to rub pads
there's also the issue of trueness of the rotor -- even if you get it perfect, it won't stay perfect.
i have the same thing happening, f&r both -- dakar xlt frame, nixon fork. i just deal w/ it. i have more energy loss from the bearing drag in my outboard BB. brake wear is SOOOOOOO negligible, the rotors would rust before the pads wore out from this.
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