When parking a bus for an extended period, to what pressure should the air system be decreased?

The correct pressure for the air system when parking a bus for an extended period is 30 pounds. This pressure level is essential for ensuring that the air brakes remain functional and that there is sufficient air supply to operate the brake system when it is time to resume driving. Maintaining a pressure of 30 pounds helps to keep the air brake system engaged and prevents potential issues such as excessive moisture build-up or brake failure.

While lower pressures can lead to the brakes not being sufficiently released or maintained, 30 pounds strikes a balance that is compliant with safety standards. It also offers a buffer against fluctuations in pressure that may occur over time, thereby promoting reliability and safety when the bus is in operation again.

Understanding the importance of maintaining proper air pressure is critical for any bus driver, as it directly impacts the safety and functionality of the vehicle during longer periods of inactivity.