I recently purchased a 1958 M52, Got the thing running like a top but stopping is the issue now. I have a very stiff brake pedal and can stop, but not very well. It feels like my foot on the brake is the only thing that is putting PSI on the system. I just replaced the airpack today, and still the same issue. It seems like the air side of the airpack doesn't work? I own 3 M35s and when I release the brakes on them I can hear the air release but on the M52, I hear no air. It was also noticed that I have no brake lights when using the pedal, but when I apply the trailer brake I do have brake lights. I read the TM and cant seem to locate my issue in the troubleshooting section. Any help is greatly appreciated.