| Author |
Message |
    
Snackbar64
| | Posted on Monday, February 19, 2007 - 11:19 am: | 
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Noticing this when I apply the front brake. Feels like the handlebars are going to shake loose. My brakes are new and the rotor doesn't seem warped. What could be causing this? |
Reepicheep
| | Posted on Monday, February 19, 2007 - 11:52 am: |
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A loose / worn steering head bearing (tighten / replace) and some "spotty glazing" on the rotor could do this.
You can just take some sandpaper and scuff up the surface of the rotor (on bike), or switch to some more aggressive pads. |
Brumbear
| | Posted on Monday, February 19, 2007 - 02:06 pm: |
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believe it or not tire pressure can effect this but I do not think it all that common I would pull the pads and have the rotor resurfaced replace the pads first though start at the end and work back |
Blake
| | Posted on Monday, February 19, 2007 - 02:22 pm: |
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Is the effect a back and forth head-shake or more just a strong pulsing action?
What does the surface of your disk look like? If it has a mottled appearance, my guess is that you are experiencing a not too uncommon effect of brake pad residue build-up. The solution is to switch to different, non-OEM brake pads, or to take a scotch brite pad and brake solvent to your rotor until it is clean.
If the residue issue is not the cause, then I agree with Bill (Reepicheep).
Brumbear,
I've never heard of anyone having a Buell XB rotor resurfaced beyond just manually cleaning it. Is it possible to turn a motorcycle rotor for resurfacing? Seems like the ZTL configuration would make that very difficult. |
Snackbar64
| | Posted on Monday, February 19, 2007 - 03:14 pm: |
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The feeling I get is like the handle bar clamps are rattling, but there is no movement when I pull on the bars when the bike is stopped. Everything feels solid. Could fork oil cause this, as I've never had it changed? I have not looked at the pads yet, but will do so when I get off from work. |
Blake
| | Posted on Monday, February 19, 2007 - 03:38 pm: |
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Sounds like the behavior of a disk with brake pad deposits to me. Look at the disk too. If it has a mottled appearance, see my related comments above.  |
Jlnance
| | Posted on Monday, February 19, 2007 - 06:00 pm: |
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Blake, I would think the holes in the rotor would make turning it difficult. You might be able to use some sort of orbital sander on it? |
Ridrx
| | Posted on Monday, February 19, 2007 - 07:10 pm: |
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My neighbor has an 03 9R that he bought used a few months ago. It had lots of discoloration/buildup causing headshake. He took it to a local auto machine shop that resurfaces cylinder heads and they put a nice non-directional finish on both sides.
Anyone know why Buell used a floating rotor and fixed caliper? Seems to me if the rotor were solidly mounted it would fight warping and give a more "connected" feel while the caliper,being smaller w/less mounting surface would be a more suitable candidate for a "self-centering" part. I am sure Buell probably has a reason, just curious. |
Reepicheep
| | Posted on Monday, February 19, 2007 - 07:25 pm: |
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If the rotor was fixed to the rim, when it heated faster then the wheel, it would expand faster then the wheel, and it would warp, right?
It's a steel rotor and an aluminum wheel, so even if they heated together, they would expand at different rates.
(Message edited by reepicheep on February 19, 2007) |
Dave
| | Posted on Monday, February 19, 2007 - 08:03 pm: |
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Snackbar64 -- What type of pads on it and how many miles on 'em? Did it start before or after the new pads?
DAve |
Al_lighton
| | Posted on Tuesday, February 20, 2007 - 01:15 am: |
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Does it happen at any speed or only slow?
My experience has been that deposits on the disc only start to shudder the front end at lower speeds, once the fork natural frequency is excited by the pulsing caused by the grabbing and ungrabbing of the uneven deposition layer. At higher speeds, the forks don't respond to the on/off grab rate.
Or not, just is my experience.
Al |
Snackbar64
| | Posted on Tuesday, February 20, 2007 - 08:33 am: |
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Dave,
They are pads from the dealer. They also installed them so I believe they are OEM. I don't ride much and I've been noticing this just recently, but not since they have been put on. I have had the pads maybe six months or so. |
Dave
| | Posted on Tuesday, February 20, 2007 - 07:49 pm: |
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My #1 recommendation ... get Lyndall pads and install them. I was convinced my rotor was warped to I got these pads. Before my front wheel would shudder while braking. With the new Lyndall pads...it's like glass again.
Like others have said ... it's the deposits.
DAve |
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Head Shake