What is a common sign that the bus air brakes need attention?

A common sign that the bus air brakes need attention is excessive noise when stopping. This is important because unusual sounds, such as loud hissing, squeaking, or grinding, can indicate problems within the braking system. Such noises often suggest that components like the brake pads or rotors may be worn, or that the air brake system itself might be malfunctioning. Addressing these issues promptly is vital for maintaining safe braking performance.

In contrast, a visual inspection showing no wear would imply that the brakes appear to be in good condition, which does not necessarily indicate a problem. Similarly, if braking feels normal, it does not guarantee that there are no underlying issues with the air brake system; sometimes, problems may not be felt until they become severe. Lastly, having no air pressure drop during operation is generally a good sign, suggesting that the air brake system is functioning correctly and is properly pressurized, but it does not provide sufficient insight into the overall condition of the brakes.