What effect does insufficient air supply have on air brake function?

Answer: C — Reduced braking effectiveness

Insufficient air supply has a significant negative impact on air brake function, leading to reduced braking effectiveness. Air brakes rely on a constant supply of compressed air to function properly. If the air supply is inadequate, the brake components cannot engage fully, which compromises the ability to generate the necessary stopping force. When the air pressure is low, the brake chambers may not apply enough force to the brake shoes, resulting in a slower response time and a longer stopping distance. This issue becomes particularly critical in emergency situations where effective braking is essential for safe operation. As a result, the overall safety of the vehicle and its ability to stop promptly is diminished, making it crucial for drivers to maintain proper air supply levels in their braking systems.