What is one of the requirements for the parking brake operation?

The requirement for the parking brake operation is that it must hold the vehicle. This means that when the parking brake is engaged, it should be capable of preventing the vehicle from rolling or moving unintentionally, especially on an incline. A properly functioning parking brake is crucial for safety, ensuring that the vehicle remains stationary when parked.

When a parking brake fails to hold the vehicle, it poses a significant risk, leading to potential accidents or injuries. Regular inspections during commercial vehicle assessments include checking the effectiveness of the parking brake to confirm that it complies with safety standards.

Other factors, such as adjustments or missing parts, can compromise the brake's functionality. Therefore, while you may find instances where parts are missing or require adjustments, these conditions do not satisfy the fundamental requirement that the parking brake must securely hold the vehicle when engaged.