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Still no luck at finding an Air/Hydraulic circuit diagram anywhere, but I was able to verify that the Trailer Air (drivers side glad hand) comes from the metered air supply and only gets air when the brakes are applied. Guess I won't have to crawl under the truck and remove a line to dump the...

If anyone knows of an Air/Hydraulic circuit diagram for the AirPac hidden in the TM’s, I’d sure like to know where it’s at. I’ve searched with no success. Thanks: Dave

Kaiserjeeps: Not sure of the answer to your immediate question, but if you check out the second link in my above post, you will see that you can check if the metered air supply is leaking through by disconecting the line to the back of the can on the air pack. There should be no air there...

Kaiserjeeps: Here are couple links to posts about similar touble. You'll have to scroll them to the top to read the whole discussion. Hope you get it sorted out. Dave...