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As for the air pressure activated brake light switch, the NAPA run-of-the-mill cheapies work fine as well. You may have to make two short connector cables because the civilian switches tend to have two clamps only, but that's about it. Opening pressure is about 6 psi on the air switch. Thread is...

Oh no! Sorry to hear that. "No air sounds" is definitely an airpack issue. You have been around the airpack for a while now and I do not want to come across as condescending - but the air sounds are not crazy loud and can easily be missed over an idling truck. I assume you tried it with air...

Before you do the expensive stuff, do two things: 1) Check the bottom of the master cylinder reservoir for rust or crud in the small bleed hole to the rear of the larger front hole in the bottom of the reservoir. You might have to draw out some of the brake fluid with a turkey baster to see the...

Your air pressure readings are definitely suspect. When the truck builds pressure, is there a point where the compressor unloads (stops producing pressure)? Or is it pumping constantly? You may have to listen very closely on idle. The governor is a cheap and easy NAPA replacement. Or it could be...