Valve under fifth wheel is leaking air

I have a 2019 T680 Kenworth hooked up to a double bunk log trailer and the valve under the fifth wheel is leaking air out of the plastic plug on the bottom of the valve when the red button in the truck is pushed in. The valve doesn't leak air when the red button is pulled out. Also, air leaks out of the yellow button when it and the red button are pushed in.

 

Thank you for sharing

 

Sounds like a air chamber on the trailer is leaking and backfeeding through the valve.

 

The valve under fifth wheel, is that the ABS valve?

 

Here's pictures of the valve under the fifth wheel and the break pods under the trailer. The second picture shows where the air is coming out. I pushed the red button in the truck and pulled the jimmy bar and no air is coming out of the pods. Air comes out of the valve faster when the foot brake is pushed in.

 

If air isn't leaking with only the yellow button in, @kwswan said, probably a trailer brake chamber.

With red button in, pull your blue air line and see if air is coming out of the trailer gladhand

 

No luck Big Road

 

No luck where? You're gonna have to explain

 

If you can't point, we can't help.

Sometimes, in trucking, you have to take off the flip flops.

 

I had to change mine once. Only the valve portion, not the part with abs wires running to it. It wasn’t expensive. That’s all I remember.