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Does anyone know why the rear brake disc has so much side to side movement as compared to the front? I've developed a resonant "hum" recently approaching a stop when using the rear. I'm fairly convinced that my source are the guidebolts that secure the disc. Moving them side to side, I can duplicate the tone I'm hearing. Looking at the front floaters, I see they have wave washers on both sides to create a bit of tension. This makes sense to me, allows them to float but takes up freeplay.
It's ironic that it started after the rear drive was rebuilt. I originally thought the disc/pads may have been contaminated with oil, took everything apart and cleaned well to no avail. The only thing different know is I no longer have wheel play as a result of the rebuild. I've read the threads about brake squeals and cow bells, but honestly have never experienced until now--03 w/ 50,000.
 

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The rotors float. As the bike gets older the washers that hold the disk wear and make some noise. It won't affect brake performance but it is annoying...
 
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