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Great idea. I will try that after work today.

Pressure does build to 120 psi after a few minutes, then the air dryer purges. So my compressor is functioning, and the air pressure switch on the side of the primary tank also appears to be working. Now something strange I have noticed when getting into the cab is that the addition of my...

Also, when I start the truck after it sits, the pressure on both front and rear air brake gauges has dropped to about 60 pounds. The audio alarm sounds until the compressor refills the tanks and the system is pressurised. The hwy light will flash alone, but the tires will not inflate, then all...

It will attempt to inflate the tires, Hwy light will flash, but then it will flash all five lights. I bumped up the air governor a few pounds as well, thinking maybe it just wasn't getting up to pressure, but that didn't work either.

Great information Suprman as always. My driver's air spring is leaking. Let me ask you this. Is it possible that a leaking cab air spring could result in the five flashing lights on a ctis ecu? I thought the problem was the air pressure transducer on the PCU, but replacement of that part still...