- If the brake system worked BEFORE the repair, then the issues you have now are related to the repair job.

- I wrote a DIY for brake lines (in forum if you search for it), the key thing is to use a wood stick and partially depress the brake pedal to stop the fluid loss.

- Now you have air in system. I don't know much about Foxwell since I use INPA.
You can put everything back together and use Foxwell etc. to activate the ABS valves to bleed...

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT