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I haven't seen any type of mechanical "fail-safe" mechanism in any of the air systems I've disassembled so far...just an air diaphragm that pushes into the master cylinder to engage brakes. If you open the drain petcock and leave it open, there's no air pressure to activate the...

I recovered 5 M105A2 trailers from Nellis AFB last summer; when I was towing one of them I noticed an increase in resistance from the trailer. I pulled over and felt that the hubs & brake drums were hot. I opened the air tank drain valve and kept it open for the rest of the drive, and the...