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Author Topic: Disc brake rub problem  (Read 4488 times)

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Offline Rockhopper

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Disc brake rub problem
« on: June 15, 2008, 11:32:31 PM »
Since y'all have been so good at answering this neophytes other bike maintenance questions, anyone know the answer to this one:

Whenever I  take off my back wheel (to fix a flat, for instance), when I put it back on, the disc brakes rub a bit, sometimes a lot.  They didn't rub before I took the wheel off. It sometimes takes me 30 minutes to get the wheel set so that the rub is minimized. Sometimes it requires loosening the axle(or is called a hub?) a little, which I bet isn't the safest way to solve the issue.

Any thoughts? Thanks

Offline slowfatguy

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Re: Disc brake rub problem
« Reply #1 on: June 16, 2008, 07:36:04 AM »
What kind of brakes? Are you sure you are getting the wheel settled into the dropouts properly everytime? Have you checked the rotor for warpage?
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Offline Pariah

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Re: Disc brake rub problem
« Reply #2 on: June 16, 2008, 03:06:40 PM »
That almost sounds like you don't have the wheel in drop outs correctly.  You can also overtighten the QR skewer.  I've had the same scenario happen to me.  I usually fix  by putting the bike on the ground.  Loosening the skwere while making sure the bike is level and re-tightening the skewer.  That usually evens the everything in the drop outs and fixes the issue.  I've also notice that if I back the skwer off about 1/2 a turn if the problem persists after the previous exercise that the brake rub disappears there too.

all of this assumes a true wheel and a true brake rotor.  if you have a warped rotor I know some friends who had luck putting in a vice and "truing" it by rotating the rotor in said vince and clamping it down.  I can't speak as to how good of an idea this is, but its worked for others I know.
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Anthem1

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Re: Disc brake rub problem
« Reply #3 on: June 16, 2008, 03:08:49 PM »
That's normal, I carry my bike in the back of my truck on a rack so I remove the front wheel. Sometimes it goes back nice sometimes a caliper adjustment is needed :)

Offline slowfatguy

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Re: Disc brake rub problem
« Reply #4 on: June 16, 2008, 07:18:30 PM »
You can true a rotor using a small cresent wrench (make sure it is clean of dirt/grease) and watching the rotor between the brake pads. It is a similar approach to truing a wheel, just bending the rotor back straight.
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Offline Gregg

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Re: Disc brake rub problem
« Reply #5 on: June 16, 2008, 08:22:02 PM »
That's normal, I carry my bike in the back of my truck on a rack so I remove the front wheel. Sometimes it goes back nice sometimes a caliper adjustment is needed :)


Is that what takes you so long to get ready? I thought you were combing your hair and primping your self! :-\

Anthem1

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Re: Disc brake rub problem
« Reply #6 on: June 16, 2008, 10:07:02 PM »
Image is everything ;D

Offline slowfatguy

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Re: Disc brake rub problem
« Reply #7 on: June 16, 2008, 10:50:02 PM »
That's normal, I carry my bike in the back of my truck on a rack so I remove the front wheel. Sometimes it goes back nice sometimes a caliper adjustment is needed :)


Is that what takes you so long to get ready? I thought you were combing your hair and primping your self! :-\

Us slow people need to look good, everyone gets to see us longer than they do you fast guys!
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Offline Jimbo

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Re: Disc brake rub problem
« Reply #8 on: June 17, 2008, 09:09:18 AM »
That's normal, I carry my bike in the back of my truck on a rack so I remove the front wheel. Sometimes it goes back nice sometimes a caliper adjustment is needed :)


Is that what takes you so long to get ready? I thought you were combing your hair and primping your self! :-\

Plus, it takes him forever to figure out your floor pump!  ;D
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Anthem1

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Re: Disc brake rub problem
« Reply #9 on: June 17, 2008, 11:43:01 AM »
What are you talking about? I never did figure it out, you had to inflate my tires for me with your pump :D Of course that's how it is with us PRIMO DONNAS, we don't travel without our support staff ;D

 

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