no sound at idle or maintaining speed..... don't see how it could be brakes. nothing to stop those from scraping continuously. applying gas or slowing down wouldn't effect it.
cv joint maybe. that would prolly get louder when turning.
and
hardly ever agree with this when i see it said. but in your case, i'd check those engine/trans-axle mounts. a front or aft mount would be in Q here. upper or lower. possible the engine is torquing/moving, and maybe an accessory pulley or something is rubbing.
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