Problem fixed!
It was again the back reserviour. It was all empty that is why I could not see any oil level, i thought it was all full. I just cannot understand why it is not larger than that and more visible. I read in this forum that many people encountered thjis problem. My car 1s 1987, hopefuly in the new designs MRBZ fixed this.
For anybody with this problem, you need to check the back, the container is then (1/2 inch thick) looks like the back wall of the reserviour. there is a mark (not very visible) says MIN. the oil level could go easily passed this mark down while bleeding before you notice. To fill the back, you need to add the fluid untill the little hole in the neck of the res. also, the level of the car is important. You need to pump the brake pedal gently until the fluid migrates to the back. it needs patience!!!
Thank you all for help.