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Glad you got it taken care of. I'm still going to put some air tool oil in my emergency glad hand and manually service the air system to keep a little lube in the system. I've been driving my truck and it seems the more I drive it the better is works ! I've oiled it twice in the last month since...

Relay valve repair is TM 24-3 page 4-591 No luck going through the TM's for the abs system. You'll need to trace the electrical connectors. I would just disconnect the solenoid at the valve for each rear axle.

If none of these work you'll need to pull the relay vents apart and clean them. You mentioned that you live in a dusty environment. They have a tendancy to get dirty and not work. Also, you might want to change your engine air filter as well. Keep us posted !

OK, disconnect the electical abs connector on the top of the relay vent and try again. Maybe the abs is closing off the vent for some reason ? Or find the abs control box and completely remove power from it. Does your abs give a good check out on startup ? The light will come on for a 3...

Those relay vents look to have the abs input as well. They work on the spring side of the air brakes. Each rear axle has its own unit. Its possible that they are not releasing air and are stuck. Try the air tool oil suggestion. Also once you have full air pressure try applying brakes, firm...

I believe, as mentioned earlier, that there might be two vents. One for the truck the other for a trailer hook up. I'm not sure. Let me dig into the TM's and look. The 9 series TM's are awful for trouble shooting the brake system. After my air brake issue I feel for ya ! I'll post up...

You might have two issues. The release valve and the brake pedal. If your truck has sat for a while and you don't empty the air tanks of moisture you might have some rust on the valves causing them to be sticky. I opened up my emergency glad hand on the very back and squirt some air tool oil in...

It sounds like since its only the 4 rear wheel assemblies something is going on with your spring brakes. Perhaps some air issues ? I would try caging all 4 rear spring brakes and do a slow test drive in an area that if the brakes stop working you'll have no issues. If the brakes still get hot...