Question In a dual air brake system: Answers Air tanks are shared by both systems. Each system has its own air tanks. You must designate which system you are using. Brakes on only one side of the vehicle will work. Explanation Most heavy-duty vehicles use dual air brake systems. A dual air brake system consists of two separate air brake systems, connected by a single set of brake controls. Each system has its own air tanks. Take a FREE Practice Test Now This questions appears in the following tests: Wyoming Knowledge Test Class A , Tennessee Passenger , Connecticut Air Brakes , West Virginia Air Brakes ,