Troubling vibration during braking - Kawasaki Versys Forum
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post #1 of 4 (permalink) Old 08-25-2011, 09:18 PM Thread Starter
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Troubling vibration during braking

I was going up some twisties today with the g/f on the back of the bike and on the way back down I felt some strange vibrations in the front end during smooth heavy braking.

It takes about a second to two seconds to start, and the brake has to be engaged firmly and with constant if not increasing pressure.

It starts off like a small vibration (like a cell phone on vibrate) and it actually starts to build in intensity until other parts of the front end are buzzing with noise from the vibration. I would guess that it is resonating whatever it is.

I don't notice it on casual freeway and city riding because I don't use the brake heavily or long enough to have it occur. I can force it to happen when I'm riding solo but I have to go fast and decelerate very quickly compared to downhill with a passenger, where I can get it to resonate for a good 3 to 4 seconds.

It is a 2009 it has 3,000 miles on it and the previous owner took great care of it.

Is it under some kind of warranty still that I can take advantage of? Does this even sound like a warranty issue?

My first instinct would be that there is something up with the rotors or calipers. I seriously doubt anything is warped, as it all feels smooth until heavy prolonged braking (and even then it builds intensity from zero, its not present the instant you start braking).

Maybe torque specs on bolts, or worse yet, maybe has something to do with the little circular collars that hold the semi-floating discs in place?

I'm going to try to ghetto rig a video camera somehow to the bike and see if I can get some recordings where you can at least hear the noise if not see the vibration (I think for the vibration the camera would have to be on the front fork or wheel assembly somehow).

Until then... ideas? Take to dealership? I'm just thinking they'll tell me its fine or its something that's going to cost me (in which case I'd rather work on it in my garage).
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post #2 of 4 (permalink) Old 08-25-2011, 09:41 PM
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Is the vibration happening when you at slow speed as it may be those little circular collars or bobbins. My were juddering but have just used my cordless drill with a bolt/ nut and two flat washers to get them turning as thread link below, check it out as the disk is supposed to float.
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post #3 of 4 (permalink) Old 08-27-2011, 04:39 AM Thread Starter
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The speed does not matter, although it is easier to get it to happen with faster speeds because I can stay on the brakes longer.
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post #4 of 4 (permalink) Old 08-29-2011, 10:37 AM
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Sounds like you have a slightly warped rotor. A rotor can be warped to a degree that it is barely noticeable under normal breaking, but manifests itself more and more as the rotor temp increases. The primary cause of a warped rotor is excessive heat (extended heavy braking), and / or sudden changes in temperature. One long, heavy braking experience is enough to heat your rotors to a degree that will cause some level of warping. Advice on long, downhill runs is to find a gear that allows your engine / gearbox to maintain a given speed. Then, if braking is even necessary to maintain speed, alternate between front and rear brakes to prevent prolonged heat build-up.

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