KELSEY HAYES PROPORTIONING VALVE KIT SOURCE

Mattax said

There was an adjustable valve that seems to have been used on some Fords and/or GMs that came with Kelsey Hayes 4 piston calipers. There's a photo of it in Mike Martin's book, and hence some might assume it was also an early factory Chrysler item.
This is all a side bar and I agree not really pertinant to the original question but worth addressing since its been raised.

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Nope.
Sorry, but strongly disagree with with your statement that Ford, and or GM had an "Adjustable" brake proportioning valve on their line of automobiles.
Previously in my former life, before getting out of the trade, i was a wrenching mechanic for 30 years.
No such thing exists in any maintenance, repair, parts, manuals, showing anything in regards to adjustable valves.
And GM Did Not use Kelsey Hayes disc brakes on any of their cars.
FORD had 4 piston calipers from, 65-67 on their cars, that yes, were Kelsey Hayes, 4 piston, but after that they went to the single piston design.