Man it's been so long I don't really remember why I recommended it that way. I think if you tighten the banjo bolt first, it doesn't give you enough flex in the line to tighten it right at the first bracket.
Logically on the front, it made perfect sense to get the brake lines installed on the assembly beforehand. On the back it's a lot trickier because the Z4 M uses a compound, 2 piece line on each side.
Helps if you have a golf tee to plug up the hard line on the chassis side to prevent too much fluid loss.
As for the ebrake adjustment, I would pull the handbrake up 3 clicks, tighten the cog until the wheel doesn't turn, then release the handbrake, then loosen the cog until the wheel spins freely.
Unfortunately I've converted to studs, so on my car this is all a guessing game.
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