To inspect an Integral Parking Brake you must:

The correct choice highlights that the integral parking brake is a sealed system, meaning that it has been designed to function without needing regular external inspection or maintenance. This inherent design limits access for inspection, as components are housed in a manner that prevents environmental elements from entering and affecting their operation. Consequently, this system is typically engineered to ensure reliability and reduce the necessity for intervention, which is why thorough inspection through standard means isn't feasible.

Other options imply methods of inspection that would not align with how the system is intended to operate. Using a borescope may suggest that there could be visible access to the components, which does not hold true for sealed systems like the integral parking brake. Removing the steering knuckle could involve unnecessary disassembly, as the integrity of the parking brake system doesn't rely on visual inspection from that angle. Disassembling the caliper could potentially lead to damage or misalignment of parts, disrupting the sealed nature of the system. Therefore, the design and operational principles of integral parking brakes support that inspection is not possible, reinforcing that it is indeed a sealed system.