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I have an '04 Fuji Tahoe that came with Avid mechanical discs...I decided to upgrade to HFX-9s, swapping out the rotors and everything else. After the break-in period I've started to get terrible vibration off the back brake. It makes a terrible racket and the noise is coming from everywhere...even the handlebars are "singing". I end up locking up the rear brake just to get the racket to stop!

I have adjusted the caliper position a number of times, and they look spot-on now, centered along the rotor top and bottom and evenly spaced side to side.

Is this an adjustment issue or something else? Is there any way to dampen the vibration?
 

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downhill2004 said:
I have an '04 Fuji Tahoe that came with Avid mechanical discs...I decided to upgrade to HFX-9s, swapping out the rotors and everything else. After the break-in period I've started to get terrible vibration off the back brake. It makes a terrible racket and the noise is coming from everywhere...even the handlebars are "singing". I end up locking up the rear brake just to get the racket to stop!

I have adjusted the caliper position a number of times, and they look spot-on now, centered along the rotor top and bottom and evenly spaced side to side.

Is this an adjustment issue or something else? Is there any way to dampen the vibration?
Hopefully that goes away after the pads bed in, but my Hayes 9 rear brake still howls more often that I would like (I can feel it right up through the saddle) and I've never been able to eliminate the problem. Make sure all the bolts are torqued to specification. Good luck.
 

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I found it took a little bit to get the set up just right. In my case, after what I had thought was a reasonable break in time, I was getting a lot of singing and some vibration.

I ended up pulling the wheels out and using some fine emery cloth in a figure 8 pattern on the rotors, using a nice flat surface to give the pads a sanding too and then cleaning the whole works out well with rubbing alcohol. When I put it all back together, I checked and set all the clearances and haven't heard a peep or felt a vibration since.
 
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