HELP!!! down-graded ABS brakes to base model brakes

[tokyo_x-treme_racer]

I have a 91 240sx fastback with ABS. Last owner replaced passenger side with another brake bracket which causes the brake not to engage evenly with the rotor. Since I can't find a pass. ABS brake bracket, and in desperate need I've downgraded the front ABS brakes to a base model 240sx brakes. Now the problem is, the brake pedal doesn't stiffen like it usually do when I press on the brakes and feels dangerous to use on the road, I've bled the whole system many times and still get the same results. I'm just wondering if I need to re-adjust the brake booster to the base model spec? or do I need a new brake booster? If that's not the problem then is it the whole downgraded brake calipers and brakes. Any help will be appreciated.

[Bronze MFP]

if the ABS unit is still hooked up you may need to bleed that as well. thats the only input i have on it. maybe someone else has some more ideas.