Front Master Cylinder

[IMM]

I’m having a problem with the front master cylinder on my FZS 600, ok here we go, i can’t  get pressure so i opted for a new cylinder kit did that still no good! when i fill the chamber then go to bleed the brakes I’m getting air coming up in the master cylinder! i no leeks anywhere and when i pump the bake lever the fluid goes back and forth in the brake bleeding pipe, doing my head in anyone got any ideas/help please?