What happens if one part of a split hydraulic brake system experiences complete failure?

Answer: B — Only the other portion remains functional

In a split hydraulic brake system, the design intentionally separates the braking system into two independent circuits. This redundancy means that if one part experiences complete failure—such as a leak in one of the circuits—the other circuit can still function normally. Therefore, the driver retains some level of braking capability, which is crucial for safety. Typically, this remaining operational circuit allows the vehicle to continue stopping, albeit potentially with reduced effectiveness or increased stopping distance. This design principle reduces the likelihood of total brake failure, enhancing overall vehicle safety. The integrity of the braking system is critical, and having a split design allows for a contingency that mitigates the risk associated with one circuit's failure.