mystery air loss

[Waterloo]

Get your soap filled spray bottle out... I have had a leak like that for three years... No clue where it is leaking out. Check the air dryer, those plastic push pull connectors get dirty and allow air to leak. Could be a brake chamber too, or a pin hole in a line somewhere under the truck. Also check the lines from the splitter on top of the transmission, you might have to go in through your boot to get to those... In the dash too where the valves are...

Good luck.