What defines a major defect concerning brake fluid leaks?

A major defect concerning brake fluid leaks is defined by the fact that the braking system requires fluid to operate. The absence of adequate brake fluid compromises the functionality of the braking system, which is critical for the safety of any vehicle. Brake fluid is essential for transferring force within the braking system, allowing the brakes to engage and stop the vehicle effectively.

If there is a leak and the fluid level drops below the necessary requirement, the brakes may fail to perform as intended, significantly increasing the risk of accidents. This is why identifying and addressing brake fluid leaks is paramount for maintaining vehicle safety.

Other factors such as fluid evaporation, color, or level above requirements may indicate certain issues but do not directly impact the operational necessity of the brake system. It's the reliance on brake fluid for the system’s functionality that classifies this type of defect as major.