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Old 07-25-03, 07:33 PM   #1
Justen
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Disk brakes rubbing

I have 8" Hayes disk brakes on my Brodie.

I understand that they flex and that they cause a pinging sound but the front brake has a rubbing sound. It doesn't seem that there is any loss of power or that the calipers are grabbing but there is this freqent rubbing sound when I am cycling with absolutely no pressure on the brakes.

I have taken it to the LBS and they say this is common with the 8" rotors.

Is this true ?

Justen
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Old 07-25-03, 07:59 PM   #2
sshock4
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yea, any disc brake will rub, its more of a problem with 8 inch rotors because its easier to bend them. for example thinking about how much easier it would be to bend an 8 inch rotor then a 2 inch rotor, now just step up to a 6, its harder but not impossible...but anyways yea, its rubbing because the rotor is slightly bent. if you find an autoshop or machine shop with a hydro press you can have them toss the rotor under it and it will be straight again, and if thats not an option, just straighten it by hand, with a crecent wrench or something similar,

good luck in getting it all worked out.
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Old 07-25-03, 08:29 PM   #3
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Quote:
Originally posted by sshock4
yea, any disc brake will rub, its more of a problem with 8 inch rotors because its easier to bend them. for example thinking about how much easier it would be to bend an 8 inch rotor then a 2 inch rotor, now just step up to a 6, its harder but not impossible...but anyways yea, its rubbing because the rotor is slightly bent. if you find an autoshop or machine shop with a hydro press you can have them toss the rotor under it and it will be straight again, and if thats not an option, just straighten it by hand, with a crecent wrench or something similar,

good luck in getting it all worked out.
Thanks for the suggestion. Although, when I took it to the bike shop, they checked out both rotors and said they were fine and not bent at all.

How easy is it to bend them ?
I have only had the opportunity to take this bike Mountain biking once..otherwise it has only been on the road and never dropped or hit.

I can't think of any time that the front rotor would have sustained any damage.

Justen
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Old 07-25-03, 08:59 PM   #4
Jim311
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Rotors get hot, and when metal gets hot, it warps fairly easily.. could be what happened, or your pads could be adjusted in too far.
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Old 07-25-03, 10:05 PM   #5
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I have the same brakes. Sometimes they get dust or whatever on the and make a scraping sound- to cure it I just quickly and firmly jam the brakes a few times toclean the rotor and pads. Also you should remove the pads and check for glazing- if so just replace them.
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