Brake Force Regulator / Proportioning Valve Specification

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I am doing an analysis and comparison of different brake compounds and need the "knee point(s)" of the brake force regulator.


This part is also used in the E12 and perhaps the earlier 6 cylinder cars with drum brakes in the rear.


Somewhere I recall that it is at 240 Lb., which seems low, but can't find it in my notes. If I need to test the parts that I  have, I need a specification to check.


Also, if anyone has information on other similar valves with different ratings that would be helpful too, though I do not want to install an aftermarket (e.g. Tilton) part.



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