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Question
A dual air brake system:
Answers
A.  Has a single air brake system, but uses two sets of controls.
B.  Has one air brake system for each side of the truck.
C.  Has two brakes for each wheel.
D.  Has two separate air brake systems, but uses a single set of controls.
Explanation
A dual air brake system has two separate air brake systems that use a single set of brake controls. One system typically operates the regular brakes on the rear axle or axles. The other system operates the regular brakes on the front axle.
Answer Statistics
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This questions is considered quite Hard

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