[Richard]

Steve,

With an air leak that big, my suggestion would not work.

Larry

That is the distribution manifold that Newell told you about. Sounds a lot like the distribution valve is stuck. I am thinking the distribution valve has to have a check valve in it to prevent all the air brake air from escaping if you have a sudden leak on the supply side.

I hope you have six foot long arms. You might rap it with a hammer to see if it will unstick.