Re: 1960 Apache K10 build
I suspect there are two ports for your Left and Right front brakes, and one port for the back brakes that T at the axle. The valve acts as your T for the front. I could be wrong. I'm using an adjustable proportioning valve on the rear only of my '61.
The factory proportioning valve should be pretty spot on for what you've done. Worry about it only if the back brakes start locking up first.
If the master cylinder has the same pistons front and rear insde, it technically shouldn't matter which one goes to the front and which one goes to the rear. I plumbed the front port to the front brakes, and the rear port to the rear brakes. Old-school iron masters often have different master cylinder volumes for each half, with the larger volume going to discs and the smaller volume going to drums.
If you can still keep the ABS (even just by moving it onto an inner fender), I think that would be super stellar awesome!
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