DOT 4, it's on the filler cap.
1 litre bottle will do the job.
Only problem I had was the front left calliper nipple was solid?
Perhaps BMW back fill the system via this nipple?
Had to remove completely and wedge a plastic tube in.
As for the ABS, looking at the manifold where the pipes go, see no bleed there. There might be a drop in the pump that can't be changed.
All fine now 18 months.