My E53 burst a line while away from home and needed a repair. The change of the line was easy for the mechanic but the bleeding was a real problem after the fluid loss - which to my untrained eye looked pretty substantial. It took a few people and a lot of time and fluid to get the pedal back to where it had been. I would imagine that the a part of the problem here is air working its way back to the ABS unit and being very stubborn to clear.
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