Alright well so far today I replaced the Q2 valve on the front. This now allowed air to be drawn from both tanks when I hit the pedal and it vented out thru the intake. After doing this the air pressure dropped very quickly from both tanks 120psi to 0 in a 10 seconds.
Next I Replaced the treadle valve. Same result. Hear air venting thru the intake. air loss is slower than before but still drops from both tanks with the pedal depressed. Letting the truck roll on a slight incline, pedal pushed and will not stop truck.
Next I had a good take off step panel that had the 2way valves # 3 and # 4, Quick Release Valve and a Inversion valve all connected. So I installed it onto the truck. Still has the same result.
Shut the primary take valve, brought the secondary system up. Hit the pedal, still vents into the intake and vise versa with the secondary shut off valve.
I still have brake lights so I know air is getting to that check valve. I will check the output of that tomorrow. System is holding air pressure after shutdown for 30+ mins.
Does anyone know what air line # lets it go back into the intake? I am using the P2p program and do not see it.
Also when hold the brakes and the driveline brake is applied the truck will roll forward on its own. The driveline brake will hold the truck on a hill and is adjusted properly