But now I am curious. Dodgeman, you explained that After each pump I must hold the pedal at the floor and before releasing the pedal the drain nipple must be tightened and then so on and so on.
But, if I use a clear hose of about 500mm long connected to the nipple it won't be able to suck air back into the system because there will be brakefluid in the hose.
As I understand also is that it sucks only a little bit back from the pipe so the chance of a air bubble being sucked in is very little.
Am I right?
In this case i can just connect the pipe to the nipple,open the nipple and pump the new brake fluid through the system, close the nipple after the new fluid is pumped through the whole system and remove the pipe and bob's your uncle I'm done.