Trailer air supply not holding

If you are the only one that pulls this trailer, the moisture came from your truck, I'd change your air dryer asap before it creates more problems.

 

I got all my knowledge the hard way unfortunately. Like the other guys said, it's time to fix some problems if you're the only one that pulls that trailer. Glad you got it going.

 

Yes. Time to replace it or rebuild it. You need to purge that trailers system when you can get it warm. Hope you watched what the guy did it case it locks up again. Get yourself a gallon of warm water and dump it on the valve if you don't have a torch. I've used that on a problem child in a bind

 

The only way moisture can get in a trailer is from the truck. Assuming you didn't get someone mad enough to pour a few gallons of water down the glad hand.

Edit to add: are you draining your tractor tanks daily? An air dryer does not keep all moisture out of a system, still got to drain those tanks every night

 

Moisture is normal in an air system. That's why we have air dryers. Pour some air line antifreeze in your glad hands and work the valves through a few cycles to purge the moisture. A frozen valve does not mean it is bad.