2026 Rhode Island Air Brakes CDL Practice Test 2

Which of the following are true about a dual air brake system?

Usually, one system operates the front axle and the other one operates the rear axle. It uses a single set of brake controls. One system is called the "primary" system and the other one is called the "secondary" system. All of the above are true.

Correct Answer:

All of the above are true.

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