During the brake system inspection, which of the following is NOT typically checked?

The inspection of a vehicle's brake system is critical for safety and performance. Among the typical checks conducted during this inspection, the effectiveness of the brakes, the condition of components such as pads, rotors, and calipers, as well as the brake fluid levels, are all standard procedures. These elements are essential to ensure that the braking system operates properly and can respond effectively to driver inputs.

The condition of the air filter, however, is generally unrelated to the brake system's operation. While ensuring that the engine can breathe efficiently is important for overall vehicle performance, it does not have a direct impact on the functionality of the brakes. Therefore, during a brake system inspection, the air filter's condition is not typically part of the assessment. This distinction is why it is identified as something that is not checked during brake system inspections.