Air pressure gauges not indicating evenly

[09pornstar]

(10-15-2018 )Nilao Wrote:  When mine had this issue it was a ruptured brake chamber on the drives. The emergency side will leak anytime the knob is pressed if ttat diaphragm ruptures. If the service side ruptures it only leaks with the brake pedal pressed

I had my buddy press the brake pedal with the engine off and i checked every brake chamber and didnt hear a thing. Even when i cruise its only dropping one side. I would expect to hear at least something with that kinda pressure drop.