Final answer:
The reference material does not provide enough information to determine the exact reduction in braking capability due to the loss of hydraulic system #2 as it does not detail the redundancy design of the braking system.
Step-by-step explanation:
The question pertains to hydraulic brakes and the impact of losing hydraulic system #2 on the braking capability. Unfortunately, the provided reference material does not contain enough information to answer the specific question about the reduction in braking capability due to the loss of hydraulic system #2. The reference material discusses the principle behind the hydraulic system and provides insights into the force amplification and ratios of areas and diameters of cylinders in a hydraulic system, adhering to Pascal's principle. However, it does not specify the redundancy or layout of the hydraulic systems in a braking system that would allow us to determine how losing one system would affect braking capability (i.e., whether the systems are parallel or independent). Therefore, without specific information about the redundancy design of the braking system in question, it is impossible to calculate the exact reduction in the braking capability.