Secondary Air won't build up.

What is the weather by you. Might have ice in the system.

 

Did they replace the govenor? Should have an adjustment on it. I take it’s a straight Truck. No trailer. Maybe its put on wrong? Any leaks you can hear? Sometimes a plug is left out of the govenor, or put in a spot it shouldn’t be. . Shoukd only have one port open for a safety valve to exhaust. They’re universal to fit different ways. The plugs need to be in the right places. Can’t think of anything else. There’s one way valves on or between tanks I think, maybe one is bad? Just a guess. Adjust the govenor up if you can. Replace if you haven’t already. Set it at 130 -135. Hopefully someone that knows more will chime in. Good Luck,

 

I’m in Arkansas. We have frigid single digit temps sometimes. I’ve actually had to smack the dryer on occasion to get the air to come up.

 

Mind was froze up, put half bottle of alcohol in the line off compressor. All good. Now the trailers froze up. Air bags won’t inflate, brakes won’t release. Put rest of alcohol in the glad hand lines. No go.

 

I get my trailer from shop today. When I hook up, I'm putting some treatment in the glad hands. Last thing I need is condensation from shop air freezing when it gets in the teens outside air.
Good luck getting yours thawed. I've taken air line off the rear airspring to release air and dislodge ice.

 

Thanks. Half bottle of alcohol I had left did the trick. I’m at home, it’s been sitting longer than planned. It’s my fault, I know better.

 

A mega told me the alcohol ruins seals etc in the air system. Don’t use it.
Secondary pulling the system down is an indication of things other than brakes themselves. Like air bags.
Mostly it’s drain your water. Shouldn’t be getting a lot of water all the time. Make sure air dryer is working.
I had a bad air dryer. Drained water 8 times a day. Sometimes would get water vapor spraying out.