Most airlines are quick disconnects now. Prolly, have to push in the retainer ring, to pop the line out of the connector.
Never tried to do it either, and our 2019 FL didn't have that dump valve either... You'll probably get real dirty under the back end, to even reach the connector lol
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Davy, I don’t have an airbag dump on my truck either. A friend on mine told me you can still dump the air by going underneath the trailer at the back of the tractor, loosen a connection and dump the air. I will have to investigate this technique before I can say I know exactly how to do this.
OOS:
When a violation by either a driver or company is confirmed, an out-of-service order removes either the driver or the vehicle from the roadway until the violation is corrected.