Kelsey Hayes Disc Brake Upgrade Question

I'll try once more, then drop it. The proportioning valve sends different line pressures to the front and rear brakes. They are made differently for different combinations of front and rear brakes based on type (disc vs. drums) and the size and details of those brakes (eg.1 pot vs. 4 pot calipers & 9, 10, 11 inch drums.) Since, I don't believe that chrysler ever made a car with 9 inch drums in back and KH discs in front there is no actual valve made for what you are doing. Yes the part is a factory part FOR A CAR WITH KH DISCS AND 10 INCH REAR DRUMS, which I don't think is what you are telling us you have.

I'm just suggesting that with an adjustable valve in place, you could adjust the pressure to the rear brakes and make it work correctly if it doesn't.