Re: Dual Master Cylinder upgrade proportion valve question.
Proportioning valves are not needed on vintage drum/drum car systems.
Your early Ford Lockheed drum brakes need residual valves with a dual master upgrade, to replace the (check) valve in the original single master. Residuals can be located behind the tube seats on many drum/drum OE masters, or installed inline with aftermarket 10# valves to each axle.
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