Flatbed Trailer no brake release and no air bag inflation

all i know is if you by accident hook up red to blue and blue to red. and push in trailer knob in truck. trailer brakes wont release and if you get out of truck and walk to back trailer tires. you will hear air blowing out of something. now will it happen on all trailers. maybe not. but all I asked was did he/she hook up lines backwards. the only answer i got was he's being pulling same trailer for 2 years and brake chambers are sealed. maybe i was wrong about brake chamber, but i wasnt wrong about the theory. give it a try. if it doesnt do it, then hey im wrong

 

Those trailers must have had universal gladhands, the red and blue ones won’t cross

 

dont know. but it was on a van. and all the vans i pull today(2018 great danes) will do the same.

 

Take a picture of a red gladhand hooked to a blue one for me.

 

nah. i dont get bent out of shape. just stated what i have been threw.

 

will thursday. im on vacation.

 

Four way brake valve is bad

 

But not a 2006 Mac. I can't find when they became mandatory, but I've only pulled one that didn't, and that trailer shouldn't have been purchased by my carrier!

 

Trailers built before ‘75 weren’t required to have them