The first action you should take to move the school bus is to:

When preparing to move a school bus, the first action you should take is to depress the brake pedal firmly. This action ensures that the bus remains stationary and secure before initiating any movement. By firmly pressing the brake pedal, the driver maintains control over the vehicle and prevents it from rolling or moving unexpectedly, which is especially crucial for a large vehicle like a bus that carries passengers.

Once the brake is engaged, the driver can then safely proceed to check mirrors, shift into drive, or disengage the parking brake while ensuring that the bus is still under control. This sequence helps to prioritize safety and sets a foundation for responsible vehicle handling.