Proportioning Valve Keeps Tripping?

[72c20customcamper]

Originally Posted by KyleSeal

From what I can hear, they still actuate. I am doing this alone so I use my phone camera to see whats going on. With the switch in, it will only send the shuttle valve backwards a small amount, and still let fluid out. When I take the switch out, it will close them entirely. At this point, I have ordered a pressure bleeder to see if I can force some sort of hidden air pockets out.

Did you change the rear cylinders? May not be correct size for the system