Trailer brakes locked

Hooked a different truck up to my trailer( trailer that was working fine for weeks and right up until swapping trucks )

All hooked up and the brakes are locked up on the trailer ,,,, air is built up in both tanks but as soon as i turn off the truck and trailer brakes the air starts dropping like mad . Also *I have a third axle that will not rise up .

I figure the lines are on wrong so i swap out red for blue ,, same #### thing .

The trailer has a valve to control the air to it ,, either up or down made no difference .

I was clueless , so was another driver helping me . Any idea what the problem is ? I have switched trailers at this job alot and never ran into this mess .

Bad air lines from the truck ?? I could hear alittle air letting go from the rear of the trailer so i know it was getting some air .

 

The little leak was nothing that would drop the air so quick . Plus this trailer was unhooked for five whole minutes before the problem started . Makes no sense .

I had worse leaks that the air would keep up too no problem .

 

brake chambers on the truck ?

 

nope, no air drop when both brakes are pulled . But push them in and you can see the needle dropping .

I remember it held air with the yellow in but red in/off was causing it to drop like crazy .

I was thinking gasoline and a match might fix it ?