My read is to pump the brakes and watch for bubbles is the point of a second person.

I don't think a second person is needed you can pump the brakes to push air out of the master cylinder then the motiv will push the bubbles out of the line.

You can activate the two needed processes (abs pump, abs valves) with foxwell this procedure is good to know the order.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)