Air leaking from brake exhaust port

[BeaufortFire]

I've spent a long time searching the forums for a similar problem. But here it goes. Have a LMTV that when aired up there is a constant air leak from the brake system exhaust port in the rear and when you pull the supply line to a front brake chamber sir leaks there too. Can you guys point me in the right direction?

 

[Ronmar]

I've spent a long time searching the forums for a similar problem. But here it goes. Have a LMTV that when aired up there is a constant air leak from the brake system exhaust port in the rear and when you pull the supply line to a front brake chamber sir leaks there too. Can you guys point me in the right direction?

Which brake system exhaust port? There are several back on that crossmember. A picture would be valuable. I just did a rear brake component explanation video yesterday that might also help you...