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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 08-03-08, 09:18 AM   #1
celerystalksme
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front brake shudder?

hello,

i just noticed that my front brakes are causing this shuddring/vibrating. what causes that? how can i fix it?

thanks!
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Old 08-03-08, 10:37 AM   #2
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i just read that maybe aggressive toe-in might solve my problem. thoughts?
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Old 08-03-08, 12:46 PM   #3
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You have slightly hinted at pad brakes. Is that correct? Hard to advise without facts and info.
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Old 08-03-08, 01:32 PM   #4
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Originally Posted by kellyjdrummer View Post
You have slightly hinted at pad brakes. Is that correct? Hard to advise without facts and info.
what info? i'm not sure what to provide.

i have a 2007 blue cx6.5 with shimano cantilever brakes...blue's housebrand carbon fork...xero lite wheels. when i brake with the front brakes, i shudders.

i did a search and i read that the vast majority of the time, aggessive toe-in of the pads will fix it. i also read front wheel shudder is prevalent in the majority of cross bikes with carbon forks and canti's up front.
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Old 10-11-08, 08:23 PM   #5
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brake shudder

I have the same problem with my carbon fork\canti setup. If you figure it out, let me know.
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Old 10-11-08, 10:17 PM   #6
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Shudder has been beaten to death in dozens if not hundreds of threads here and elsewhere.

Usually enough toe in to reduce braking power will stop it.

One of the biggest causes is the fork flexing under braking, which pulls the brake cable tighter. Mounting the cable stop at the crown usually stops it.

Mini-Vs always stop it.

Way rigid forks usually stop it.

Rim / Pad combinations that are less prone to grabbing often stop it.

Google and search threads here and about the web.

Mostly if it isn't scary bad, we learn to live with some of it. It usually happens worst on pavement at low speed which is not a real big deal.
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Old 10-12-08, 04:04 AM   #7
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Shudder has been beaten to death in dozens if not hundreds of threads here and elsewhere.

Usually enough toe in to reduce braking power will stop it.

One of the biggest causes is the fork flexing under braking, which pulls the brake cable tighter. Mounting the cable stop at the crown usually stops it.

Mini-Vs always stop it.

Way rigid forks usually stop it.

Rim / Pad combinations that are less prone to grabbing often stop it.

Google and search threads here and about the web.

Mostly if it isn't scary bad, we learn to live with some of it. It usually happens worst on pavement at low speed which is not a real big deal.
Anyone ever tried a brake booster like we used to use on vintage MTB's? The fork legs aren't moving with one on them installed.
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Old 10-12-08, 08:09 AM   #8
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You could also try hitting the rim with some sandpaper to remove any glaze off the surface.
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Old 10-12-08, 07:40 PM   #9
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The old MTB booster kept the legs from spreading - here we've got the fork bending back. Autospirits got the practical idea of trying to keep the pads from being grabby. Sometimes works.
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Old 10-12-08, 07:53 PM   #10
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My Avids squealed like crazy, but my Pauls don't. Not saying you have to drop that much cash, but it could be just the brakes themselves too.

One thing I noticed on the Avids is I could wiggle the brake a bit on the mounting post. Like the tolerances weren't that tight in the mechanicals and that allowed more vibration. My brakes might have been just beat up - i.e. new Avids might not have that problem - but it's worth looking at.
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Old 10-13-08, 05:45 AM   #11
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Mini-Vs always stop it.
Never say "always", but slapping a mini-V on my carbon fork has worked very well. I recommend using a travel agent if you have road levers.
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Old 10-18-08, 07:02 PM   #12
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THanks Flargle, we are talking fork shudder here. THere is no "always."
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