brake bias

[Nitro]

The car had a two piston master cylinder and a dual diaphram booster when I got the car. The problems were even worse. Both front wheel cylinders were leaking, and the right rear axle seal was leaking.
I've replaced everything back to original, I think?
I replaced the front rubber lines. As I replaced them, the small steel line running from the distribution block to the rubber line broke. I replaced it. I haven't replace the longer steel line running to the right front. The car does brake straight, when braking normally. Under an emergency braking, it locks up both rears.