During a pre-trip inspection, which of the following is essential to check?

Checking the brakes and lights during a pre-trip inspection is crucial for ensuring the safety of the bus and its passengers. The brakes are a vital component that directly affects the bus's ability to stop safely when needed, and any malfunction could lead to dangerous situations on the road. Similarly, the lights play a key role in the visibility of the bus to other drivers and pedestrians, especially during low-light conditions. Ensuring that both the brake and indicator lights function properly enhances the bus's safety by making it clear when the driver intends to stop or change lanes. Skipping this check could lead to serious safety risks and is a fundamental part of the required pre-trip procedures for school bus drivers.