Trailer auto inflation system question

30 minutes to get it up to pressure usually means a nail or something stuck in a tire. You should be able to hear or feel it. An auto-inflator can fill a completely flat tire in 30 minutes.

 

Clearly you have one though. Spray soapy water on the treads. You might also try unscrewing the inflator hoses in the morning when you know the pressure will be low and check to see which tire is low.

 

I may be a smart ace here, but use your eyes? May only be barely leaking.

 

If it only did it the one time after getting new tires: the shop may have only put 30 or 50 lbs in the tires , knowing that your inflation system will fill them up the rest of the way.
I told a shop to do that once, they were busy and I was in a hurry. Trailer was empty, tires were up to pressure by the time I got to load point.

 

Heck, had one yesterday that had a bolt in the tire and leaking around it. No light at all from the auto inflation system.

 

One possibility is that the tire shop inflated the tires above the set point of the system. Tiremaxx is supposed to regulate the air to stay within a set range. I don’t know if Meritor does that or not.