Manual front Disc Brakes?

ir3333 said

... the hold off valve incorporated in the combination valve delays pressure build to the rear so the front not only apply braking first but also supply about 70% of the total braking..

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Good comments. One possible correction - research "front metering valve" in the combo valve, which I think is the same as "hold-off valve". I recall reading that it holds off pressure to the front disks until the rear drum shoes move to contact the drums. I think it is simply a spring-loaded "pressure relief" valve that pops open ~10 psig or so.

Lets not even get into comments in another post that rear disks are better since rear drums "are not strong enough". Nobody explained how that meshes with needing a proportioning valve to reduce pressure to rear drums so they don't lockup the rear wheels.