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Emergency side should be consistent with gauge reading so 120 psi for a fully working air system. Brake pressure on the service line will depend on the amount of pressure exerted upon the brake pedal and the sensing valve in the air pack. Here is where people need to really understand the...

Might work, I haven't had that trailer in over 2 years so I don't have a way to try it. I was just posting what my observations were. I never said running without the brakes functioning was correct, I was merely posting what my experiences were. I have an M1102 with functioning surge brakes now.

I came up with my "solution" to the missing air tank problem after studying an M105A1 trailer. As you pointed out, they do not have a "break away" system. I connected my air line in the same manner. I posted a thread on here concerning my locking of the wheels issue to no avail. I had...

When I had an M105 trailer, the air lines and tank were missing. I ran an airline straight to the airpack and connected it to the driver's side "Service" gladhand. The trailer would lock the wheels under rather mild application of the brake pedal so I never used them again. My stopping...