Treadle Vac - compensating valve?

[nellis003]

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I ended up installing a proportioning valve. They're normally used on cars which have had front brake conversions in order to keep the rear brakes from locking up. I put one on the front brakes and dialed it down, and now it doesn't nosedive when I hit the brakes.

Unfortunately, I was driving it today and the power assist disappeared on me halfway through the trip. I started another post on that problem, but if anyone has an idea on why that would be happening I'm all ears.

Thanks
Nick