Which condition can lead to premature brake wear in air brake systems?

Answer: D — Frequent use under heavy load

Frequent use under heavy load can significantly contribute to premature brake wear in air brake systems. When a vehicle carries more weight than it is designed to handle, the braking system must work harder to stop the vehicle, generating more heat and increasing the friction on brake components. This can lead to accelerated wear of brake linings and reduced overall brake efficiency. Additionally, the higher strain placed on the braking system can cause components to fail sooner, leading to costly repairs and maintenance. Understanding this principle is crucial for maintaining optimal braking performance and ensuring safety on the road.