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A good discussion of proportioning and valves...

prop valve tech

The '60s FSMs called for the valve to output a constant 360 to 405 PSI with a constant 500 PSI input.

At some lower pressure (varies by model, or adjustment on adjustable valves) the rubber "stage" seal does not close, so it is basically straight-thru. Once the set pressure is reached, it is, effectively, a small piston pushing on a larger one, reducing pressure by the ratio of (the area of) one to the other. If it "equalizes", there's internal leakage (which may well be common, since most stops only last a few seconds and these weren't precision implements!)

Again, the bulk of the proportioning was done by the ratio of F/R mechanics and hydraulics, as it should be. On a typical '60s Mopar, the fronts do 60-65% of the work.

Rick






A very interesting read, Rick. Thanks.
I did go back to my stock Prop. valve. I just got done installing it. Bled the system, and it does feel a whole lot better. I have yet to drive the vehicle, but all initial indacations look good. I'll be driving it today. So if you don't read about me in the news, or obituaries, all went well.
Thanks agin to all who helped out.