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Old 01-03-09, 10:49 PM   #1
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Front Brake rub on Avid Ultimate disc brakes

My LBS tells me this is within normal range. I call bullsiht on that. The rear brake doesn't rub at all. I want zero rub. How much rub is 'normal' if any on disc brakes? I think I have a defective brake. Getting it sorted out is a pain, I'll wait until the winter is over and leave it there @ my LBS for them to send back to Avid for warranty, but it will disable the bike for a few weeks.
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Old 01-03-09, 11:10 PM   #2
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Hell Fire, the post ***** has wandered over here too.

Sheesh.













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Old 01-03-09, 11:12 PM   #3
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they rub a little but ussuall if a rotar is out of true it can be trued with a cresent wrench or you can unlok the swewer and adjust it until it isn rubbing. how many miles have they got?
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Old 01-03-09, 11:13 PM   #4
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It's normal, Peep.
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Originally Posted by bragi "However, it's never a good idea to overgeneralize."
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Old 01-03-09, 11:17 PM   #5
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Pistons not retracting all the way back into their bores can lead to rub. As well as a tweaked rotor. both simple fixes that a competent shop ought to be able to handle without any warantee issue.

This is something that can happen and be pretty common with any brand of disc brakes.

If you ride your bike in the woods, you're going to develop rotor rub once in a while.
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Old 01-04-09, 06:01 AM   #6
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Why does my front brake rub, but my rear brake does not? This bike is less than a year old, about 1,000 miles on it, half of it in the woods, half on the road.
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Old 01-04-09, 08:09 AM   #7
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If you had bought the bike from them, maybe they would give you a different answer. . .
I'm just kidding, people are entitled to get whatever bike from where ever they want. Road bikes excluded
Should have bought from them
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Old 01-04-09, 09:40 AM   #8
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If you had bought the bike from them, maybe they would give you a different answer. . .
I'm just kidding, people are entitled to get whatever bike from where ever they want. Road bikes excluded
Should have bought from them
Oh yeah, that would be worth the $3500 price difference. Now you're thinking.

Don't worry, they'll straighten it out. I race for a team they sponsor and I'm buying a brand new $5K road bike from them in January. I've been a customer there for 16 years, and have purchased 4 bicycles there in 4 years, and plenty of other stuff.
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Old 01-04-09, 10:01 AM   #9
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it is january. lets see that 5k road bike!
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Old 01-05-09, 06:46 AM   #10
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it is january. lets see that 5k road bike!
February.

That bike is total friggin vaporware.
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Old 01-05-09, 06:39 PM   #11
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Might pay to check the set up. I have various Avid disc brakes of various rotor sizes (165mm, 185mm, 203mm) on my bikes, and none of them rub on the rotor. When you lift up the wheel, it should spin freely without rotor drag.

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Old 01-06-09, 07:49 AM   #12
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What I do when I set up disc brakes is loosen the post bolts on the calipers, spin the wheel, grab the lever til you're locked in, tighten the bolts down, check for rub, rinse, repeat.
It helps to give the lever a few squeezes before starting to make sure you get full engagement.
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Old 01-06-09, 03:34 PM   #13
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I have the same issue. Avid mechanical disc brakes, front rubs and rear does not. I have put about 500 miles on the bike, it had maybe a 100 when I bought it. I will try the caliper bolts like you describe.
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Old 01-06-09, 04:09 PM   #14
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Could be a couple things...

1. Fluid could need replacement (not as likely since you say < 1 year old)
2. Proper adjustment of the front caliper. I was having an issue and had the cailper tabs faced. Not a single issue since.
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Old 01-06-09, 04:10 PM   #15
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When this happens with my Avid Juicy 5's I have been able to solve it by losening the caliper and then folding a business card in half and slipping it over the rotor and pushing it into the caliper. This will center the caliper , retighten the caliper and the rotor should be in the center.
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Old 01-06-09, 04:19 PM   #16
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A beast such as Pcad should be able to "burn" through any rub issues.
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Old 01-06-09, 05:32 PM   #17
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If the rotor is a bit out true, and if you're really bent of shape about it, you can put a new rotor on there (if bending it back into shape with the handle of a wrench doesn't work for some reason.) Or you can just ride it and use your brakes, and it'll likely straighten itself out in the long run.

Oh, and you know there's this "search" thing on BF. I know you're kind of new here an all, but...
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Old 01-06-09, 05:40 PM   #18
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Re-center the caliper. A monkey could do it. If it doesn't work then get a new rotor or true the old one.
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Old 01-06-09, 06:33 PM   #19
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Quote:
Originally Posted by emj2390 View Post
they rub a little but ussuall if a rotar is out of true it can be trued with a cresent wrench or you can unlok the swewer and adjust it until it isn rubbing. how many miles have they got?
Consider this a "verbal slap".


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Hi Jimmy!
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Old 01-06-09, 06:37 PM   #20
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Re-center the caliper. A monkey could do it. If it doesn't work then get a new rotor or true the old one.
You make it sound too easy. You know hard hard it is to find a monkey ?
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Old 01-06-09, 06:42 PM   #21
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You make it sound too easy. You know hard hard it is to find a monkey ?
. . . Especialy one that knows bikes?

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Old 01-06-09, 06:45 PM   #22
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I just painted a "Doug shaped" target on myself

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Old 01-06-09, 06:47 PM   #23
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^^ First one looks like a downhiller . . . right down to the opposable-'thumb' bare feet!
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Old 01-06-09, 07:32 PM   #24
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Toooooooo funny!
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Old 01-06-09, 07:58 PM   #25
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5th one down looks like a downhiller as well.
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