Which of the following is a sign that brakes may need adjustment?

Answer: B — Unusual noises when braking

Unusual noises when braking can indicate that the air brakes may need adjustment. When braking systems develop issues such as worn components or misalignments, they often produce sounds like grinding, squeaking, or thumping. These noises are signals that something within the brake system is not functioning correctly, which may result from improper adjustment or wear and tear. Monitoring brake performance is crucial for safety, and recognizing these auditory signals can help drivers address potential problems before they lead to complete brake failure. Keeping an eye (or ear) on unusual braking noises is an essential part of regular maintenance checks. On the other hand, high air pressure typically suggests that the air system is functioning correctly, while fast response time could indicate that the brakes are working efficiently. Faster stopping distances can sometimes be a sign of increased braking power, though they may also signal a need for adjustment if they exceed normal limits. However, these other options do not directly reflect adjustments that may be needed in the braking system.