when bleeding is not self evident: The bleed hose terminates in a BMW "speed fill" assembly which is zip tied to the RS of the frame. This barrel contains ball bearing and a spring. The bearing will be somewhat seized in the opening if sys hasn't been bled in a while. poke it with a drift opt A: remove the speed fill adapter and replace with a conventional 10mm x 1 bleed nipple from the auto parts. You will knead a pencil flame torch to melt the thread lock on the speed adapter opt b: retain speed fill adapter. fit the 10x1 adapter in the speed fill adapter. Cause it to depress the ball bearing but do not drive it so that the ball obstructs the other (inner opening) of the speed fill adapter. i.e. tun it just a little so that the ball is half way though it's travel. either method will allow fluid to flow out of the bleed hose. Blow, suck or let it drain by gravity. It doesn't really matter. Watch the paint.