Is the service side suppose to have a tractor protection valve ? Or just the supply/emergency side?
I’ve always tested tractor protection valves by depressing the supply dash valve and waiting for the tractor protection valve to cut off air.
but I’m reading something that is saying there is one on the service side as well?
can anyone confirm?
I’m plumbing this international to tow air brake trailers and I believe I got the supply side all figured out. Just need to figure out the service side now