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. Will also affect the other system. 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. Take a FREE Practice Test Now This questions appears in the following tests: Pennsylvania Knowledge Test Class B , North Dakota Air Brakes ,