What component of a bus braking system utilizes air pressure to function?

The braking system that utilizes air pressure to function is designed to effectively manage the large forces required to stop a bus, which is significantly heavier than personal vehicles. Pneumatic brakes operate by compressing air, which then creates pressure within a brake chamber that activates the brakes when needed. This system is especially beneficial in larger vehicles, such as buses, as it provides more power and enables smoother braking performance.

By using air pressure, pneumatic brakes can quickly and effectively engage without the risk of brake fade that might occur due to heat buildup in other systems. In contrast, electric brakes rely on electrical signals, hydraulic brakes use fluid pressure, and disc brakes refer to a type of braking configuration. These alternatives do not utilize air pressure as the key component in their operation, highlighting the unique capability of pneumatic brakes in bus safety and performance.