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Help us with your nomenclature use. The "spring puck" is called the brake chamber. Your wrecker driver had the brakes "caged" which is to use a stud/nut assy to compress the spring inside the brake chamber to allow the truck to roll. There is no adjustment inside the chamber. Your wrecker...

Yup, sounds like the valve may be doing it's job, and you have problems with your chambers like Steve said. Let us know how this turns out.

Looks like the inversion valve p/n 12422306. What it does from the Haldex website: Straight trucks and some tractors use an Inversion Valve which does not function during normal operation of the vehicle’s brake system but operates in the event of a primary (rear service brake) system failure...