What is the main advantage of air brakes over hydraulic brakes?

Air brakes are specifically designed to handle the greater stopping power required for heavy loads, which is a critical advantage when operating large commercial vehicles. The fundamental principle behind air brakes is that they utilize compressed air to engage the braking system, which provides significant force compared to hydraulic systems. This is particularly beneficial for larger vehicles like trucks and buses that transport heavy cargo, as the braking system needs to exert more force to safely stop the vehicle under substantial weight.

Additionally, the air brake system can be engineered to allow for better modulation and control, particularly when descending steep grades or managing heavier vehicles. The ability to maintain effective braking performance under high loads helps prevent brake fade, which can occur in hydraulic systems when they become overheated.

This capability is one of the reasons why air brakes are mandated for larger commercial vehicles, emphasizing their importance in ensuring safety and effective stopping power in commercial transportation.