Sealco 110500 slow to set spring brakes

That air is probably coming from the service valve. Release the brakes and see if air is coming from the blue line

 

Wait actually that would be incorrect. I think it just prevents brake compounding.

 

So that service signal goes back to a ABS module/computer and that is where all the service lines come from. That abs module isn't that old either. The only other place that blue service line goes is towards the front. Any idea where my issue could be?

 

I aired the trailer back up and then released the brakes. NO AIR at the blue service signal line. Air is still draining back out the red gladhand until the trailer tank is empty.

 

If when you set the brakes, there is no air to the 11500 except the supply port, then it has to be bad.

Can you post a pic of both valves to be sure there isn't something were missing?

 

Here is the 110500. It is brand new I just picked it up yesterday. The one before had the exact same issue. I turned it in for a core. I also have an old one I kept.

 

Here is the abs computer/service brake controller. That blue line goes to the 110500 service signal port.

 

Looks pretty standard. Only other thing I could see causing it would be a bad service valve, in conjunction with a bad brake chamber diaghram.

 

If you plugged all 4 chamber supplies, and removed the service line, release the brakes, then set, you rule out everything else

 

None of the brake canisters have any audible leaks. That service controller isn't all that old. I definitely don't want to buy a new one because it is EXPENSIVE. Plus the service brakes work properly. The trailer literally just has this one issue and it is kinda driving me nuts. I suppose at that particular warehouse I could just manually drain the tank quick before I drop the trailer off. It would then pass the "tug" test even if they picked it up immediately.