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Removed the compressor unloader top and found sticky goo on the valve mating surfaces(see photo) I believe the goo was intermittently causing the valve to stick in the unload position. After cleaning & lubing with ATF all seems to be well. Time will tell. Many thanks to those who offered help.

Thank you folks for the excellent tips, questions, and for supporting me during my learning curve. I haven't done a COLA test but will find the procedure and will not drive it until it will pass. I'm guessing it's in the -10 manual. A new buzzer unit is on the way and I will have that...

UPDATE: My air pressure troubles are not over:( I started it up today and it built up to 120. Drove it down to the fuel station with no problems. Drove about 20 miles to the house and had 90 to 120 until I got about 2 minutes from the house, then the primary drops below 90, and slowly...

The Independence, KY parade is in the afternoon. We CAN make the Edgewood parade! Please count us in and confirm there is room for us. looking forward to meeting you all :)

Installed new stop switch, air dryer and air governor. Now my brake lights work and the air pressure hasn't went low yet

We would go but already committed to the Independence, KY parade.

Thanks to all for your replies. I replaced the air dryer with the newer "Purest" type. Had to swap the stock governor fitting with the one from the original because the threads were different. About a half ounce of water drained out of the old air dryer governor port when I had it on the...

Replaced the stop switch today and that solved the problem. For those who have difficulty locating it, my 1981 AMG M931A1's is on the inner left frame rail between the transfer case and the rear corner of the fuel tank.

Can anyone out there advise me on how to check for and remove air on top of the compressor as mentioned above? I have a newer MRAP dryer and a new govenor on the way and will be installing them before the truck is driven. Should I open up the bleeder ports and blow air through the system...

The vehicle is grounded until the air dryer and governor are replaced. Who are these guys from which I can obtain a new one without breaking the bank?

Thanks for the reply, how do I check/solve this?

I'd remove the governor and clean/rebuild it at the same time I do the dryer. Where's the place to get kits?

Thank you for your reply, I figured the dryer is suspect. So I should pull the dryer and clean it out? Is there a rebuild kit? I would like to maintain the original parts as much as possible. Also I should mention that before adding air to get pressure built up, the governor tube was removed...

I just purchased a M931A1 (2010 RRAD rebuild) and am having flakey air pressure issues. Being new to these vehicles and never having troubleshot Diesel/Air Brakes, I am not sure what "correct" is regarding air building and pressure fuxuation. However I believe what I am experiencing is...

I'm an electrical engineer and it's been said a soldering iron is an extension of my hand. I use a Weller adjustable temp iron but fortunately did not need to use it. The rubber was not brittle and with a little rotating pull the wires came right off. One of the pins on the bad stop switch...

Thank you for this post as I thought this could be my problem as well. It may be the problem in someone's else's case but not mine. Through troubleshooting with the manual, and answers from the good folks here, I was able to identify the problem without throwing parts at it. No love from...

There are USSC bucket seats with five point harnesses. The drivers seat has the same. It came with a 20' drop side ammunition trailer painted to match. i wanted to post more & better pictures but the site wouldn't take them unless I reduced them so small that they're not worth posting. If I...

This had a rebuild in 2010 and all of the wiring I have seen is in like new condition so hopefully there will be no crumbling or grumbling during the replacement. And for the record I would solder the correct ends on if any damage occurred. I'm in the "do it right the first time so you're not...

I figured that was how the switch functioned, thank you for confirming.

Purchased this 1981 M931/A1 with 1400mi, 40hrs and drove it from Jacksonville to Cincinnati.