M129a2c trailer brake operation single circuit, towing question, any help please.

[JW7tonWY]

Recently bought a trailer reported as a M129A2C, it has air over hydraulic brakes - Can i just connect the blue line from my tractor to operate the brakes? Kind of leery of using the brakes but at the same time want to know I can. It may have been sitting along time and the brakes might just have one stop left in them...

 

[Mullaney]

Recently bought a trailer reported as a M129A2C, it has air over hydraulic brakes - Can i just connect the blue line from my tractor to operate the brakes? Kind of leery of using the brakes but at the same time want to know I can. It may have been sitting along time and the brakes might just have one stop left in them...

.
Yes, connecting the red and blue air lines from your tractor. When you release the tractors (red) park brake you should hear it release back at the trailer. And when you pull the hand valve down (slightly) in your tractor - you should feel the brakes working... The M129A2C most likely doesn't have "spring lock" brake chambers.

On the other hand, just hooking up to the trailer and taking off down the road might be a real disappointment.

 

[98G]

Why would you not connect both lines?

Am I misunderstanding something?