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Question:

A dual air brake system:

A Consists of two separate air brake systems that share a single set of controls.
Explaination

A dual air brake system is made up of two separate air brake systems. The systems share a single set of brake controls, but each has its own air tanks, hoses, and lines. One system typically operates the regular brakes on the rear axle or axles while the other system operates the regular brakes on the front axle.