Chasing this down. I’ve been having issues with a wheel speed sensor that I replaced and had to wire in since it didn’t have a plug. Thought I had it squared away and this came up. I did the shuttle valves a few years ago. 3 amigos come and go have since I’ve owned the truck. Usually I replace the wheel speed sensors and that fixes it for a while. Started having some issues when the brakes would squeal and 2 of the 3 would come on and go off when I restarted the truck.