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shudder under front braking

Old 06-19-2011, 09:39 AM
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shudder under front braking

If I'm coming to a stop with the front brakes, say from 60mph, I notice a shudder in the front end at about 30mph or so. It's about in the middle of the braking event, and lasts briefly; in other words, braking onset is clear and solid, braking finish is clear and crisp, but in the middle there is a slight but noticeable shudder. Pads on both sides look clean and newish.

Suspension? Rebound damping? Tires look good and uncupped. Wheel balance?
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Old 06-19-2011, 12:02 PM
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Is there any movement at speeds or is it just under braking?

Because it wouldn't be balance if it were only under braking.

One thing I typically do before diagnosing any braking related problems, is I will leave the system completely intact, and basically wash the entire system in brake cleaner and then give it a go.

It might also be a warped rotor, I had that problem on one of my older bikes and it was only around 35mph it would start to do that, anywhere over or under and I wouldn't feel it because the braking pressure would over-come it. When I checked it, visually it was straight but on a runout checker it was off by like .02 degrees and that was enough to make the front end all wonky under braking.

And what is the shudder, up/down, side/side? all movement transfers differently through the front end so it's difficult to diagnose sometimes.

It does sound like it could be suspension problems, but I am by no means an expert (or all that knowledgeable on it) so if you have any questions, theres a post in the knowledge base about suspension and various adjustments that you could try!
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Old 06-19-2011, 12:06 PM
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Sounds like you need to take the calipers apart and give them a good cleaning.
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Old 06-19-2011, 12:06 PM
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And it could be partial glazing on one or both of the rotors
When you clean them, use a piece of scotch brite and brake cleaner. Won't scar the rotors.
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Old 06-19-2011, 04:15 PM
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I'll try the brakleen method. Although, could it be the <gulp> head bearing?
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Old 06-19-2011, 04:42 PM
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Originally Posted by natewill View Post
I'll try the brakleen method. Although, could it be the <gulp> head bearing?
Not likely with the symptoms you describe.
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