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The system does a pressure test to look for leaks and to determine tire pressure. If it senses high pressure it sends 12psi to hold open the wheel valves and dump. If the wheel valves dont have that continuous 12psi they will not stay open to dump. A bad hub seal will trick the pressure test but...

Mechanical system. Low pressure holds open wheel valves to dump. Fill pressure diluted via leak and the wheel valves see low pressure and are tricked into dumping. Very common.

Sounds like a bad hub seal or small air leak somewhere thats not enough to trip a fault but dilutes the fill pressure by the time it makes it to the wheel valves.

Air leak on the fill not enough to trigger a fault. System does its check and sends air to fill but a leak somewhere dilutes the air pressure so the wheel valves only see around 20psi which tricks them into dumping air. Did you hear any siren like whine sound?

The system sends 12psi to hold the wheel valves open to air down the tires. If you have a fill side leak somewhere it can trick the wheel valves. Even though the valve body is sending full pressure the leak is venting out somewhere and around 12psi makes it to the wheel valve and you dump air...

Does the system do an initial pressure check and then attempt to fill air? You will hear air moving thru the cab valve body in spurts usually.

If it sounds like a groaning siren it's a bad hub seal. A bad hub seal can truck the wheel valves into thinking they are seeing dump pressure and your tires will deflate. If you think there is a leak around one of the wheel valves find an assistant with some windex and spray the valve lines and...

Sounds like you have an air leak somewhere. When the system does its initial pressure check it detects a leak and faults.

The unit that owned it probably put schrader valves in the wheel stems. Chances are it had some failure they close not to fix and just disabled it.

Maybe some moisture somewhere is froze up in the system creating a partial blockage which is causing less pressure to the wheel valves then. The system sends 12psi to the wheel valve to hold them open to dump air. Issues can cause pressure loss to the wheels and mimic the dump pressure.

If the system is attempting to fill but the front tires are deflating then you have a fill air leak. The system is sending fill pressure but due to a air leak the front wheel valves are only seeing around 12psi which holds the wheel valves open and makes you dump air. Probably a bad hub seal...

I have seen replacement switches with pigtails you would have to crimp or solder on the packard connectors. The switch is not the same as the low air switches although they may look similar. Will

I found filters on the bay it was like 10 bucks shipped for 6 of them. I think you can soak and clean them though. Will

There is no ctis alarm. If you hear an alarm it is low air or your brake is on. The click is the valve assembly sending air to do a pressure check. Are there any lights lit on the ctis controller. You may have to turn on the light switch to see them. Will