What is the initial step when preparing to park a vehicle during a pre-trip inspection?

The initial step when preparing to park a vehicle during a pre-trip inspection is to apply the parking brake. Engaging the parking brake is crucial because it secures the vehicle and prevents it from moving unexpectedly while the inspection is being conducted. This ensures both the safety of the inspector and the integrity of the vehicle during the inspection process.

While turning off the motor is an essential action that typically follows, it is important first to establish a secure and stable position with the vehicle to eliminate risks associated with it rolling or moving. Checking mirrors for safety and ensuring the area is clear are also vital steps but they generally come after securing the vehicle to ensure a safe environment for conducting the inspection. Thus, applying the parking brake establishes a fundamental safety measure before proceeding with other aspects of the pre-trip inspection.