Arkansas Commercial Driver License (CDL) Practice Test

The two main types of braking systems on commercial vehicles are air brakes and hydraulic brakes. Air brakes are widely used in commercial vehicles, such as trucks and buses, because they provide greater stopping power and are more reliable under heavy loads. This system operates using compressed air, which activates the brakes when the driver presses the brake pedal. The use of air allows for quicker and more effective braking in larger vehicles, especially when dealing with the physics of stopping heavy loads. Hydraulic brakes, on the other hand, utilize brake fluid to transfer force from the pedal to the brakes. While these systems are commonly found in lighter vehicles, they are also present in some commercial applications. However, in the context of larger commercial vehicles, air brakes tend to dominate due to their efficiency and performance characteristics. Understanding these systems is crucial for safely operating commercial vehicles, as knowledge of their operation, maintenance, and limitations can directly affect road safety and vehicle control.