Which of the following is NOT part of the comprehensive component checked by OBD II?

The comprehensive component checked by On-Board Diagnostics II (OBD II) primarily focuses on aspects that are critical for evaluating and monitoring the vehicle's emissions control system. These components include the fuel system, ignition system, and misfire detection, all of which play significant roles in ensuring that a vehicle operates within regulatory emissions standards.

The fuel system is analyzed to ensure that the fuel is being delivered efficiently and that emissions are minimized. The ignition system is monitored to ensure that the engine is firing correctly, as misfires can lead to increased emissions. Misfire detection is also crucial since it directly impacts how effectively the engine burns fuel; a misfire can result in unburned fuel escaping into the exhaust system.

In contrast, the braking system does not fall under the scope of OBD II emissions monitoring. The braking system is vital for vehicle safety and performance, but it does not directly influence the emission levels of the vehicle. Thus, it is not part of the comprehensive component checks performed by OBD II, making it the correct response to the question.