Which of the following items is critical for checking pre-operation?

Pre-operational checks are essential for ensuring the safe and efficient functioning of a forklift truck. The brake system is particularly critical because it directly impacts the operator's ability to control the vehicle and stop it safely. If the brake system is not functioning properly, it could lead to accidents, potentially causing injuries to personnel or damage to property.

During a pre-operation inspection, operators must verify that the brake system is working effectively, which includes checking the brake fluid levels, inspecting the brake pads for wear, and ensuring that the braking response is immediate and effective. This thorough check helps to identify any issues before the forklift is put into operation, promoting safety in the workplace.

While the other items, such as load capacity, oil quality, and the headlifting system, are also important for a comprehensive operational check, the brakes hold a primary position due to their critical role in ensuring safe stopping and maneuvering of the forklift. Neglecting brake maintenance and checks can have severe consequences in terms of safety.