For US spec cars: For the first service 15K - 18K you only need an oil change and inspect the pollen filter. For the 2nd service, replace pollen filter, oil change and brake fluid flush. 3rd serice is all of the above plus air filter replacement. So I have been told by my dealer.
For German spec cars BMW says to replace the brake fluid yearly, not every other year as for US specs.
I am also amazed that BMW has nothing listed in their maint books - to tell us what our cars need done. dumb.