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Damaged rim brakes

Old 02-26-12, 08:22 PM
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prankster
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Damaged rim brakes

I just noticed my bike makes noise whenever I brake. I found out the rim brake is damaged. It looked like it was hit by a sharp object. Is there something I can do to fix the damage? Like using sand paper for the whole rim brake surface.

It doesn't affect the braking performance so far (I think). But the noise is annoying. Should I just move on and let the rim brake surface wear down naturally?

Thanks in advance!


Last edited by prankster; 02-27-12 at 09:12 AM.
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Old 02-26-12, 08:25 PM
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Rock chipped the rim , maybe crud imbedded in the brake pad?
I see the rim not the brake, new brake pads and use,
will smooth out that, very, tiny divot.

Last edited by fietsbob; 02-26-12 at 08:28 PM.
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Old 02-26-12, 08:30 PM
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I had a similar issue with my brakes except that it was a "feature" - my wear markers are indented divots like that. My solution was to use some fairly fine (400?) grit sand paper to smooth out the rough edges, fill the hole with epoxy, and sand again to ensure that it's flat. You only need to sand a little bit, don't remove too much material.
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Old 02-26-12, 08:52 PM
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Originally Posted by fietsbob View Post
Rock chipped the rim , maybe crud imbedded in the brake pad?
I see the rim not the brake, new brake pads and use,
will smooth out that, very, tiny divot.
I checked the brake pads, they are smooth. No imbedded rock whatsoever.

Originally Posted by ivan_yulaev View Post
I had a similar issue with my brakes except that it was a "feature" - my wear markers are indented divots like that. My solution was to use some fairly fine (400?) grit sand paper to smooth out the rough edges, fill the hole with epoxy, and sand again to ensure that it's flat. You only need to sand a little bit, don't remove too much material.
I was thinking the same thing. I might do that if I have left over epoxy in my garage.
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Old 02-26-12, 08:56 PM
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my wear markers are indented divots like that.
they may be the 'coal mine canary' warning you Its time to replace your rims ,
before thinned so much, the tire pressure blows them apart..
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Old 02-26-12, 09:39 PM
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Originally Posted by prankster View Post
Like using sand paper for the whole rim brake surface.
Definitely don't sand the entire rim, that's not necessary. Looks like a minor ding. I'd just deflate the tire (to make sanding easier) then carefully sand the burr flat with coarse sandpaper or a small file.

You could leave it alone but it will be annoying and probably wear out your brake pads a lot faster. Given that the fix is maybe 2 minutes worth of work I'd just do it.
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Old 02-26-12, 10:14 PM
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Was thinking of sanding the whole rim to even the surface wear. But probably I don't need to do that.

Originally Posted by FastJake View Post
Definitely don't sand the entire rim, that's not necessary. Looks like a minor ding. I'd just deflate the tire (to make sanding easier) then carefully sand the burr flat with coarse sandpaper or a small file.

You could leave it alone but it will be annoying and probably wear out your brake pads a lot faster. Given that the fix is maybe 2 minutes worth of work I'd just do it.
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Old 02-26-12, 11:15 PM
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Originally Posted by prankster View Post
Was thinking of sanding the whole rim to even the surface wear. But probably I don't need to do that.
Nah, that'll only wear out the brake track which is what your brake pads do already every time you use them. The ding in the photo isn't much bigger than a pin-head. If you're careful sanding/filing it down (IMO a small file is better than sand paper) the rest of the braking surface will be unaffected and you shouldn't notice any pulsating as you would with an uneven rim.
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Old 02-27-12, 01:49 AM
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Just to be clear, you're wanting to sand the edges of that ding down, not sand until the ding its self is gone. If you sand til the ding is gone, you'll at the very least have awful pulsating braking, and worse rim failure from too little material. There's a little lip of metal (burr) that was pushed higher than the rest of the rim you want to remove, nothing more.
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Old 02-27-12, 09:29 AM
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Originally Posted by MilitantPotato View Post
Just to be clear, you're wanting to sand the edges of that ding down, not sand until the ding its self is gone. If you sand til the ding is gone, you'll at the very least have awful pulsating braking, and worse rim failure from too little material. There's a little lip of metal (burr) that was pushed higher than the rest of the rim you want to remove, nothing more.
I will try that today after work. Hopefully it's nothing too serious.
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Old 02-27-12, 12:30 PM
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Done. Not my best job. But the rim is smooth. I used a flat file a little bit and 600grit sand paper.
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