17 Freightliner Cascadia Evolution Airline Leak

Good day to all, I have a 2017 freightliner cascadia evolution with slow air leak somewhere but cant find the source. I broke down one day and had to be towed, the wrecker driver had bypassed the airlines so he can hook to his air system. This leak problem started after this tow and getting worse little by little. So here's my question where is the bypass outlet/line where wreckers tie in?

Have you tried calling your company's road service department? They will tell you what to do.

The tow truck driver probably didn't rewrap the threads with teflon tape. That is probably the culprit of your air leak

Did you check your gladhand seals? He may have accidentally knocked one (or both) out when he hooked his wrecker's/rotator's airlines up to your rig, and stored yours during the tow.

Did you check your gladhand seals? He may have accidentally knocked one (or both) out when he hooked his wrecker's/rotator's airlines up to your rig, and stored yours during the tow.

It still leaks even when bobtail. But they are fine.

Have maintenance check the cabs air ride leveling valve, those can stick open and cause a slow constant leak..

I'm presuming that you don't have an audible air leak that you can rely on for tracking the issue. Does your tractor protection function work properly during the fan down air brake test? We had a tractor here that developed a leak (not audible) in the transmission system (automatic, air actuated) that had to go in for a warranty repair...