Sorry I didn't fully read your first post. So did you end up getting all the bubbles out? I don't think the abs issue. It certainly sounds like a classic brake line leak, but your not seeing fluid. I would check the lines once more and then look at the rubber hoses. You might have a bubble.

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2