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Got ahold of person who had done maintenance on the truck, the air dryer was not serviced, so we will start there, we will upgrade it to the newer/better one as I have seen many people on here suggest. The truck is still sitting where we parked it, with the brakes locked on, so we cannot even...

Doug, we only use/move the truck about once a week, so we do only purge the lines on days when we use it.

I am completely with you on not driving it until we figure out WHY it happened, so we can make sure it doesn't happen again. I am not the one that actually services the trucks, I haven't been able to get ahold of the person that did the oil change and services on it so I can't confirm if it was...

New update from the truck: After the truck sat for a couple of hours the brakes started miraculously working a little bit, meaning flooring the brakes made them stop the vehicle slowly. After the truck sat for a few more hours now the brakes will hold the vehicle in place and appear to be...

Working on the answer to this. Thank you and everyone else that is trying to help with this!

I'm rounding a bit here, this morning when it failed it was about 29 degrees according to weather history, currently we're sitting around 24 degrees, cold front is coming in. I'm still thinking that these things should operate in the cold shouldn't they?

It is cold out here, about 20ish degrees, but these things should be good to -40, 20 above should be like t-shirt weather for them shouldn't it? I do assume that the temperature probably played a role since it is really the only thing that has changed in the last 6 months.

Negative on caging. Vehicle worked fine for last 6 months, we park it on a hill frequently so we know the emergency brake works properly (and chock the wheels) even sometimes in traffic at lights if I'm going to be there for a while I'll pop the E-brake on and it holds the vehicle quite well...

Thanks, we did air down completely and checked, brakes were non-existant, we aired it back up, brakes were still non-existant. How do we "check" the valves and assemblies you mentioned? The only leak is the slow leak by the left rear wheel, it still builds and holds air fine, so even if this...

I have a 1997 1078 that has worked flawlessly for 6 or so months since we got it. This morning while making a 10 mile trip about halfway through the trip pressing the brake pedal failed to do ANYTHING, luckily I did't NEED the brakes and was able to downshift to about 5-10 mph when I pressed the...