Which part of the steering system requires checking for missing components such as nuts or bolts?

The steering gear box is a critical component of the steering system, responsible for translating the driver's steering wheel movements into the turning motion of the vehicle’s wheels. It is essential to ensure that all parts of the steering mechanism, especially the steering gear box, are secure. Missing components such as nuts or bolts can lead to a loss of control over the vehicle, resulting in severe safety hazards.

Regular inspection of the steering gear box helps identify any issues that could compromise the steering performance. If any fasteners are missing, it could cause the gear box to become loose or misaligned, which might lead to steering failure. Thus, checking for all necessary components being in place is vital for the safety and reliability of the vehicle's steering system.

The other options, while important components of a vehicle, do not directly pertain to the specific requirement of checking for missing components in the steering system. Leaf springs relate to the suspension, the brake system pertains to vehicle stopping capabilities, and electrical connections are relevant for various vehicle functions but do not specifically address the steering gear.