Sounds a lot like air in the brake lines to me too. The Haynes manual for my 650GS says the same as above. Apparently, bleeding an ABS system requires 'special equipment' that only BMW dealers have. Nuts to that. My old Honda ST1300 had ABS and linked brakes, and the pipework for that was horrendously complicated. Nevertheless, there was a recognised bleeding procedure which was lengthy and complex, but perfectly do-able by a reasonable DIY mechanic. I think this is BMW being a bit precious.
I'm guessing the 'special equipment' is a vacuum bleeder, something like a Mityvac - readily available, if a little costly. Anyone know? (Would be worth bookmarking for when I need to do this to the GS.) Might be worth trying a conventional bleeding method on the rear brake line before calling the cops.
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