Invented in the 19th century by George Westinghouse and first employed to stop trains, air brakes were fitted to trucks and other large vehicles in the 1920s.
Since that time, air brakes have proven to be both reliable and safe. Unlike hydraulic brakes, air brakes systems work effectively over large distances in bigger vehicles and are tolerant to small leaks. With the addition of emergency spring brakes and system’s division into primary and secondary systems, air brakes have become the preferred method of stopping large vehicles such as RVs and tandem axle trucks.
Authorities have mandated that all drivers operating air brake equipped vehicles take this course as part of their professional training.