What should be done once the air governor cutout is achieved during inspection?

Once the air governor cutout is achieved during inspection, bumping up the RPMs and verifying the cutout pressure is essential for ensuring that the air braking system operates within the designated specifications. The air governor regulates the air pressure in the system; therefore, confirming the correct cutout pressure is crucial for safety. If the air pressure reaches the proper level and the governor cuts out as expected, it indicates that the system is functioning correctly and can provide reliable braking performance.

It's important to maintain RPMs during this verification, as it helps to ensure sufficient air supply is maintained while observing the cutout. This step confirms that the air system has the capacity to maintain required pressure levels for effective bus operation without any potential leaks or malfunctions.

Other options, such as restarting the bus immediately or checking other vehicle fluids, do not specifically address the necessary verification process required after the cutout occurs. Removing the key from the ignition interrupts the inspection process and does not contribute to assessing the air system's readiness. Thus, bumping up RPMs while verifying cutout pressure is vital for a thorough and effective pre-trip inspection.