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All three of those are 2way check valves. They allow control of the brake systems by either the truck controls or the front gladhand. The bottom two are for front and rear service brakes and connect to pedal and blue service glad hand then back to those brake systems. The top one is for...

Yea that was just that outer solenoid cover. It’s only purpose is to allow for a fitting to vent to the outside. You could remove it and the unit would vent the control air into the cab, the same as is pictured above. They did that on the A1R(at least on the 6X) as they used all the floor...

The PCU uses pilot operated valving. The solenoids control a small amount of air to shift the valve cores in the manifold. So you have seals in the solenoid valve and seals in the core. It could be a seal on a solenoid valve, or the seals on the control core are leaking a little…

No that vent should not be venting until the control solenoid is released… yes the PCU can be disassembled to access the valve cores. They seal with Orings and I believe Superman has spare valve cores…

Have you checked your axle vents? An axle seal will vent air into the axles which will escape thru the axle vent…

Well if the pressure is dropping, then you have a leak:) I think the controller pauses and looks for this pressure stability as a way to diagnose leaks. With control closed and a shot of air to pressurize the system it should be able to set there all day. For a given size hole, the greater the...

I believe It is normal, at least the two I have played with now do it also Even after new valve cores. The supply does(should) not leak when control is de-energized. The solenoid valves in the PCU are pilot actuated and they may be plumbed to deliberately interact this way. (Would alert you to...

Hooked to the ctis port on the wet tank the air will get a chance to shed moisture in that tank. The times I have applied air to the truck I have not noticed any moisture buildup in the wet tank, but other than when filling tires I havnt run all that much shop air thru it..

I put a street T right above that point where the CTIS pressure switch is located. That was a little easier and is 1/4” NPT…

The front red/emer glad-hand feeds two places. 1. Thru a check valve to charge the wet tank. 2. The upper 2way behind the drivers grill/behind drivers step. Sounds like tgat second line or the fitting at the 2way is leaking…. It only sees pressure when you feed air into the emergency glad-hand.

Think you got that backwards. The emer gladhand that pressurizes the system and releases the park brake is on the passenger side service glad-hand that applies the service brakes is on the drivers side…

Yep, front emergency(red) glad-hand charges the truck air system. use a regulator set to 120 PSI. It also releases the park brake, so chock the wheels… Applying air to the front blue service glad-hand applies the service brakes. The problem with troubleshooting CTIS is it works in cycles, so...