In a dual air brake system, a leak in one system: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question In a dual air brake system, a leak in one system: Answers Always means there are leaks in both systems. May not affect the other system. Is not something to worry about. Explanation A dual air brake system is made up of two separate air brake systems. If there is an air leak in one system, it may not affect the other. This questions appears in the following tests: California Class A Knowledge Test California Air Brakes