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Yes, that's what I should have said. The calibration is just fine. The air bags just prevent it from being relevant! Thanks for confirming that. I've never messed with brakes, and the concept of these valves is new to me. Anyway, it sounds like it's bad mojo to use air bags, then. When...

Hmmm. That would imply that installing adjustable air bags to take some of the load would mess up the calibration of the proportioning valve. Since the air bags would prevent the bed from settling down as much, the valve arm won't get moved as much as it should, so you'll get less braking...