Picked up an 08 BF650, rear brakes not working. Had to use a heat gun on the diff to get it to drain. Ran Marvel Mystery Oil,diesel, atf ...filled, drove around, drained, filled, drove, drained, filled multiple times until it started getting pretty clean. Then filled with tractor oil(tractor hydraulic oil). Drained, filled, drove, etc. My rear brake still sucks, but I can lock it up if I stomp on the rear brake foot pedal. Maybe the more I ride the better it will get.
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