Air Brake Practice Test

Brake fade in an air braking system is primarily caused by overheating due to excessive use of brakes. When brakes are applied repeatedly or held on for extended periods, especially on long downhill grades, the brake components, particularly the brake drums or discs, can reach extremely high temperatures. As these components heat up, they may begin to lose their effectiveness. The friction material can become less effective at generating the necessary stopping power, leading to a reduction in braking ability, known as "brake fade." This phenomenon can severely impact vehicle safety, as it can lead to longer stopping distances or even brake failure if not addressed. Understanding the causes of brake fade is crucial for safe operation and effective maintenance of air brake systems. Other factors listed may affect braking performance, but they do not specifically lead to the condition known as brake fade.