brake chamber leaking from rear when brakes applied

it only leaks when i step on the brake pedal. At no other time will it leak. I cannot tell at the moment which way the pushrod moves as i'm alone now with the truck. I believe from memory it moved inward when a friend applied brakes.

Should the non leaking brake chamber also have the pushrod moving when brakes applied? Is one of these brake chambers sound like it is working correctly or do both have separate issues?

 

so flip the lines on the brake chamber that is leaking correct? does this mean caging the brake chamber again and removing it, or hopefully just swapping the lines? Based on my brief description does the other side sound to be operating correctly? THANKS !!

 

starting to wonder if they were ####ed up to begin with... i bought this nightmare truck with a ton of problems. Interior was all duct taped together!! i thought i hooked up the air lines identical when i removed them... I'm starting to wonder if they were crossed by the previous owner (not trying to save face.. i'm a terrible mechanic), but i changed the brake chambers because the parking brake was not holding the truck firmly when i put in gear. (before i put on the new chambers and all new shoes I actually drove it for a few hundred feet not knowing the parking brake was engaged!)

 

once i know which lines are getting air from the parking brake or pedal then what? Thanks Baha

 

also why would air be leaking out when brake applied? it would do that if lines crossed or is something broke internally?