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vibration while braking

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Old 05-01-19, 07:43 PM
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bonsai171
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vibration while braking

Hello,

I have a Kilo TT, and am having a problem with a strong vibration getting transmitted thru the handlebars during heavy braking. So far I have tightened down the brake caliper, and tightened the quick release skewer on the front wheel. There is no noticeable play in the fork, so I haven't messed with that. The rim was bought last fall, and the brake pads are brand new kool stop salmons. What could be causing the issue?

Dave
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Old 05-01-19, 07:53 PM
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79pmooney
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This is a symptom of a fork that is about to break. I had both fork blades crack at the fork crown, one 3/4 of the way around, the other 1/4. The vibration when stopping was wild. This built up very quickly late on a 40 mile ride. The last 4 miles I didn't use the front brake.

There are a lot of other causes of the vibration you are seeing, but take this seriously. If it is a cracked fork, the bike is trying to tell you AND it failing can be life altering. (BTDT. The cost was staggering.)

Ben
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Old 05-01-19, 08:06 PM
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Not to discount the afore mentioned safety inspection(which is a good point), also rim brakes require periodic scotchbrite/windex scrubbing of the pad material and junk off the surface. Disc rotors sometimes as well for that matter.
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Old 05-01-19, 08:15 PM
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Loose headset probably.
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Old 05-01-19, 08:43 PM
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bonsai171
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Originally Posted by seau grateau
Loose headset probably.
Thanks for the responses all. Just took the front wheel off, and found some hairline marks on both fork blades where the blades meet the crown. Can't tell if this is supposed to be there or not. They look straight for the most part. Will probably take it to a shop to have them look at it.

Dave
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Old 05-01-19, 08:50 PM
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Originally Posted by bonsai171
Thanks for the responses all. Just took the front wheel off, and found some hairline marks on both fork blades where the blades meet the crown. Can't tell if this is supposed to be there or not. They look straight for the most part. Will probably take it to a shop to have them look at it.

Dave
That is potentially concerning, so good idea to have it looked at. Definitely don't want to experience a fork failure out on the road.
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Old 05-01-19, 08:56 PM
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Sounds like it is time for a new fork. Glad you noticed it and said something and are hopefully going to do something about it. Most people would probably just try to ride it out.
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Old 05-01-19, 09:36 PM
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Originally Posted by bonsai171
Thanks for the responses all. Just took the front wheel off, and found some hairline marks on both fork blades where the blades meet the crown. Can't tell if this is supposed to be there or not. They look straight for the most part. Will probably take it to a shop to have them look at it.

Dave
Give the fork blade a hard pull away from the crack. Say 20 pounds of pull at mid-blade. If the fork is good, no way are you going to harm anything. If the crack opens up, well now you know.

Ben
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Old 05-02-19, 03:58 AM
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bonsai171
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Originally Posted by veganbikes
Sounds like it is time for a new fork. Glad you noticed it and said something and are hopefully going to do something about it. Most people would probably just try to ride it out.
Got a wife and 3 kids. In a couple of weeks, I will be the only one working. Much better to replace a fork (though that sucks!) than to spend a couple weeks in a hospital, and risk not being able to ride again. Took a couple of pics of the cracks:


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