I've used the manual one from Wilwood on a couple different race cars and a rodded 56 pickup. On my pickup I just went out in the gravel and kept adjusting it till the rear tires skid just after the front. Been that way for 5 or 6 years now and seems fine. I just re-did the brakes on my CJ-7 too and that was my test. Skid in the gravel! It turned out alright without a proportioning valve.
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