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If you're not going to use the factory rear axle proportioning valve, why don't you take it apart and let us know what's inside. I bet it is a couple of different sized holes that line up depending on position of the lever arm. It must have high quality seals and I'd like to know what they are...

That proportioning valve arm is there so when the truck is empty, the brake pressure is low enough to keep the rear brakes from locking up, especially in wet weather. When the truck is loaded, the brake fluid is allowed to flow at full rate so you can stop that heavily loaded heavy duty truck...