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Correct you air up the trailer first. Not like the modern systems that need air to release parking. We need air to apply parking so tank needs to be filled or have plenty stored and holding. No air no brakes parking or moving. This also works as the brake away system as long as the tank holds...

Don't agree on hook up of trailer. Most older military trailers do not have spring parking brakes and they can move if you bump them.

Yea You said it correct, independent of the foot peddle up to full on braking force same a peddle. Some independents with there own tractors and pulling a trailer that was not there's would use the trailer brakes and save the tractor's in some cases. The wag seems to be more problem with ball...

Agreed I don't believe it would put any more braking force then the foot brake at full peddle. I use mine like you said when hooking up or fifth wheel adjustment. Yes with small trailers on the hook not fifth wheel plate if the load is not correct or the tonque weight is not correct the small...

Rerouted mine from trailer to passenger eject seat.