When using the foot/treadle valve, it'll be the primary air system.
When using the Johnson bar, it'll be the secondary air system.
It supplies air to the service chambers of the brake chambers in order to engage the brakes.
If you're referring to air brake systems, primary air supplies service air pressure to the brakes on the drive axles and the trailer axles when the foot valve is used to brake. The secondary air system supplies service pressure to the brake system on the steer axle, as well as the trailer when the hand valve is used to apply the trailer brakes.
If you're referring to air brake systems, primary air supplies service air pressure to the brakes on the drive axles and the trailer axles when the foot valve is used to brake. The secondary air system supplies service pressure to the brake system on the steer axle, as well as the trailer when the hand valve is used to apply the trailer brakes.
In an air-brake equipped vehicle, the primary air system supplies service braking pressure to the drive axles of the vehicle, and, if applicable, supplies service air to the trailer axles when the foot valve is used for braking.
supplies air to the trailer brakes to allow the operator to release the brakes
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Trailer emergency supply line and trailer service line.
There is a connection issue between the trailer brake controller and the trailer.
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If you want to purchase a fruehauf trailer, then you can go to any motor vehicle specialized retail service, and ask if they sell the trailer you are looking for.