Good evening, obviously my old Lancia is equipped with a “self-ventilating braking system”.There happened: the brake force regulator was a bit leaky, and since I had to wait for the new one, I just filled up brake fluidity every few days.As there was once too little inside, air came into the system, and the pressure point on the pedal wandered down (brake power was still there), with several pushthroughs he wandered up again until he then went down again (so normal S ymptome for air in the circuit) Filled everything again, pressure point remained clearly below, since one should remove the system.Later I filled again after (because again some brake fluid was lost while driving), and see there, the pressure point went again a little higher. Then later on the next time fill up there were no signs of air in the system (normal pedal resistance) at full braking power. My guess: Due to the somewhat leaky brake force regulator flowed also Brake fluid with air intakes to the outside, which was replaced by refilling with new brake fluid.Thus, the system was almost “aired” by the leaky regulator and my refilling.(At least I find no other explanation why the air in the system was suddenly gone).Or? (The controller has been replaced by the controller)