Eta Non ABS master and BBK?

[ForcedFirebird]

Remove the proportioning valve and you have the two female threads left in the master, just like any other car. The e90 didn't come with LSD and the ABS system actually will put the brakes on the spinning wheel. That's why there's only "one" outlet on the proportioning valve, so, just unbolt that tee-looking-thingy (green circle) and run your lines direct to the master.

[Zesty Bonanza]

Just to follow up since I don't check the forums that often.... The T-line split adapter for the brake lines seemed fine and I took the car to the canyon a few times and the car handling/braking felt great.