Michigan CDL - Air Brakes Practice Exam

The correct choice identifies "brake lead" as not being a main component of an air brake system. In an air brake system, the primary components include the air tank, governor, and brake chambers. The air tank stores compressed air, which is essential for the operation of the brakes. The governor regulates the air pressure in the system and ensures that the air compressor operates efficiently to maintain proper pressure levels. The brake chambers convert the air pressure into mechanical force, which applies the brakes. In contrast, "brake lead" is not a standard term or recognized component within the framework of air brake systems. It does not pertain to any aspect of air brake functionality or assembly, which makes this option the correct answer. Understanding the main components of an air brake system helps in recognizing how they work together to ensure safe braking in vehicles equipped with air brakes.