[Jack Houpe]

Just a suggestion but when you have time I would get rid of the plastic push to lock fittings if they are not leaking now they will at some time. Also make sure your compressor is regulated to no more than 120 psi to be safe, I think Richard has a story about that.

[meltdown]

When I re pipe I will . Thank You

[Richard]

DUDE !!!!!!! You are fantastic. You are going to be a SUPER OWNER.

That level of documentation, and thinking on your part, makes remote diagnosis so easy. After all garbage in, garbage out.

I think you already have the answer. It’s plumbed wrong. And there may or not be a check valve to prevent the manifold from back feeding the supply tank.

Let me summarize so that you can easily check your plumbing plan.
The lines from the HCV’s should be plumbed directly behind the travel solenoids. The HCV’s are fed from a supply tank.
Both of the raise solenoids should be plumbed to the supply tank. There may be a check valve somewhere in that line to prevent the air bags from back feeding the supply, IF the raise solenoid valve leaks.
The back of the lower solenoid position should be open to the atmosphere.
And of course the air bags are connected to the remaining ports on the rear.

Great Job!

I am not surprised that it is plumbed wrong. I have been dragged into a couple of conversations with Chassis Techs who could not get their heads wrapped around how it is supposed to work. One of them didn’t listen and replumbed the owners coach. As fate would have it , I met the owner a couple of years later, and we replumbed it again to make it right.