Does anybody know why.... - BMW Luxury Touring Community
 
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post #1 of 2 Old Jul 31st, 2007, 4:26 pm Thread Starter
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Location: Crownsville, MD, USA
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Does anybody know why....

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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post #2 of 2 Old Jul 31st, 2007, 5:50 pm
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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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