Re: AR Brakes
With the one piece activation arm they should work as well as any Model A brakes. When you say they are to the service bulletin specs have the tracks and rollers been restored? The other item is the shaft in the front brakes that needs to be 7.5inches if I remember correctly. The arm on the front brakes should lean forward at about 15 degrees. The rod inside the activation system wears down and that causes a reduction in brake pressure. Check this before popping for new drums.
As an aside I use a different brake adjustment procedure than in the service bulletins. This came from a Ford mechanic at the time the Model A was new. Get all four wheels off the ground. Undo the clevis pins on the brake rods at the adjustment point. Tighten the shoes until the drums do not turn. Tighten the brake rod adjustment until you can just get the rods back on the pin then back off the adjusting wedge until the wheel will turn. Now when you hit the brakes it will really lock them up if need be.
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