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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.

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13y ago

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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.


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