I already went through the Avid Elixir rear brake issues on my Enduro, and had it mostly silent with "perfect" centering of the caliper, but recently I badly bent the rear rotor, prompting the purchase of a new one and new pads. Since then I have had odd noise issues that are different than before.
When used rarely (climbing or straight trails) perfectly silent.
When used hard (long downhill sections) maybe a little noise once or twice, but mostly silent.
When used off and on (twisty singletrack) they make terrible noises braking before almost every corner, vibrate, but do seem to work fine. The noise goes away just before lockup occurs.
The only thing I can think of is heat. While cold or hot they are quiet, but loud when warm. If I brake and pedal through it the noise goes away for a little while, but comes back. Also, I have struggled to replicate this noise riding on the street, so every time I think I have it fixed, it comes back when I get to the trail.
(also, I made sure to properly bed in the pads and have tried cleaning and sanding several times)
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