What must be inspected on a school bus regarding brake systems manufactured after March 1, 1987?

When inspecting school buses that were manufactured after March 1, 1987, it is essential to verify the presence of audible or visible brake warning signals. This requirement is crucial because these signals are designed to provide immediate warnings to the driver when there is an issue with the brake system, ensuring the safety of the bus, its passengers, and other road users.

The inclusion of audible or visible warning signals is a critical safety feature, as it alerts the driver to potential brake failures or system malfunctions early enough to take necessary precautions, such as stopping the bus safely. Adherence to this requirement is part of ensuring that the bus is compliant with safety standards, which are established to protect students during transportation.

While the presence of a dual hydraulic system and the functionality of brake lights are important aspects of the bus's braking system, the primary focus of this specific inspection pertains to the warning signals. These signals offer immediate feedback to drivers, making them fundamental to the overall safety of the vehicle and its operation.