What indicates a defective air brake system related to compressor settings?

A defective air brake system can be identified by certain compressor settings that deviate from the standard operational parameters. Cut-out pressure, which refers to the maximum pressure that the compressor will build before shutting off, is critical for ensuring that there is sufficient air pressure in the system to function effectively.

When the cut-out pressure exceeds 1000 kPa, it indicates that the compressor is set to a higher pressure than what is typically acceptable for safe operation. This can lead to potential issues such as excessive wear on air system components, risk of bursting air tanks, or inconsistent braking performance. Thus, a cut-out pressure greater than 1000 kPa demonstrates a defect within the air brake system's compressor settings.

Other options, such as cut-in pressures being too low or too high, might suggest issues, but the specific parameter of cut-out pressure greater than the norm is a strong indicator of a malfunction that could lead to system failures. Understanding these pressure settings is crucial for the safety and reliability of air brake systems in commercial vehicles.