Proportioning Valve

Ok. Now I have two different, opposing pieces of input.

This is Power Disc to Power Disc. This car had the Kelsey-Hayes front discs from the factory. I put 75 A body spindles and discs on it for better stopping power and the big bolt pattern.

Does this info helpnarrow down the potential problem with the proportioning valve?

I get this vision of standing on the brake pedal and rolling into a wall.

Thanks,

fastmopar