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Parking brake switch with roller lever triggered by parking brake lever (blue arrows). Red arrow is where air is escaping (pivot point I think).

Did some testing, after 1 hour and 15 minutes, pressure dropped from 115psi on the gauges to 70psi. I also let it sit over night and while the gauges read 0/10psi, the drain valves all released pressure when I open them this morning. I have a new front axle switch on the way, but I think the...

Thanks for the replies. I have done the soapy woder trick while plugged into house air. The only two places I can hear air is from the park brake air switch and the front axle engagement switch. I guess I really do need to time it and verify how long it maintains air.

How long should my tanks maintain pressure while parked? I know ideally there are no leaks and it is infinite, but in reality what is a usual time to drop from 120psi to 60psi to 0psi? I know of a few minor air leaks on my truck and debating if I should fix them due to the cost and effort...