And that makes sense since those would be applying air to the truck brakes themselves. Hopefully someone here has deleted the 5th wheel connection before and can point me in the right direction. That's the only brake components I have messed with since they were last working so seems like a smoking gun not sure.Hmmmm
I know that there is a procedure to delete the front towing air connections. And if down wrong....park brake won't release.
Make me wonder if it's a similar problem.
@Ronmar would know.