Problem w/ 300zx brake swap

[Miller White]

Me and a friend did the 300zx brake swap on my 90 240 and the back brakes blead fine but when we try to bleed the fronts we pump them and the fluid level in the 300zx master cylinder goes down and we get pressure built up and then bleed them. After about 10 seconds it loses pressure and the fluid level rises, We blead them for a few hours, idk wth is going on with them. If youve had this problem or just know how to fix it id really appreciate it, thanks

[r3v_v3ng3]

did you swap the left to the right or vice versa?

[positron1]

Are your bleeder screws on the top or the bottom?