Brake mastercylinder on 1990 Honda Accord

I have a 89 accord put a M/C on did a good bleed job 1 man and 2 man,and of course bench bled it but fluid is dissappearing from resevoir and i can not see where also replaced the rear wheel cylinders bc the bleeder screws broke off and when I apply the brakes the rears lock up it does not seem like the fronts are working at all even though fluid comes from calipers. I am thinking a bad M/C or maybe a bad proportioning valve, but they usually do not go bad.I can pump up brake with ignition off have hard pedal and when crank car pedal goes down a little and within 2 minutes or less goes to the floor, so what do you think? Thanks in advance for your help

Asked by for the 1990 Honda Accord
The new MC could ne leaking in the brake booster.
1 more answer , 2 more comments
Are you still losing fluid from the reservoir? The front calipers could be binding. Give me a call, maybe we can take a quick look.
Yes I am, it is almost empty but i can not see where, some of the brake lines go thru passenger compartment so i can not see all lines and connections. The car is not too hard to push so I do not think the calipers are binding. I do not see your phone # anywhere so I can not call you
Sorry,
770-343-9027
Jimmy at North Fulton Auto Center