mr. nixon described a metering valve, not a proportioning valve.
most FGFs did not have a proportioning valve, which reduces pressure to the rear brakes on hard stops. Birds with A/C and disc had them. All FGFs with front disc had a metering valve, which delays front brake action as described.
a combination valve may have either or both of these functions. They were separate on the FGFs.
Metering valve Meters fluid flow to the fronts
Proportioning valve reduces pressure to the rear in Proportion to the front.
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