What are common signs of a malfunctioning air brake system?

Answer: B — Warning lights, unusual noises, and longer stopping distances

A malfunctioning air brake system can lead to several notable signs that indicate an issue. Warning lights may illuminate on the vehicle's dashboard, signaling a problem that requires immediate attention. Unusual noises, such as hissing or grinding sounds, can arise from air leaks or malfunctioning components, indicating that the system is not operating as intended. Additionally, longer stopping distances are a critical sign of brake issues; if the brakes are compromised, the bus may take longer to come to a complete stop, posing a safety risk. While decreased fuel efficiency and increased weight might affect a vehicle's overall performance, they are not specific indicators of air brake malfunctions. Similarly, increased speed and improved acceleration suggest a performance enhancement rather than a braking system problem. Lastly, better handling and reduced vibration point to improvements in vehicle stability and comfort, which are unrelated to brake function and could mislead one away from recognizing the issues at hand. Understanding these signs is essential for diagnosing air brake problems effectively and ensuring the safety of the school bus.