Proportioning valve?

AJ/FormS said
Yes I have no p-valve. But I have 295/50-15s out back and small wheelcylinders. It is possible to balance the system without one. I bought an adjustable one expecting to have to use it, but never required it.

I also did a disc brake up grade on my 73 Duster. I installed a pv, but it's set at wide open as my 295 / 50- 15's never lock up either.