Final answer:
The aux pump in motorized pumps used in power brakes plays a critical role in maintaining hydraulic pressure and ensuring smooth operation of the brakes. Its continued operation after the engine shuts off helps preserve the functionality and safety of the brake system.
Step-by-step explanation:
In the context of motorized pumps used in power brakes, such as those in bulldozers, the aux pump is responsible for doing most of the work in the system. This pump helps maintain hydraulic pressure and ensures smooth operation of the brakes even when the engine is off. By keeping the aux pump running even after the engine shuts off, it helps to preserve the functionality and safety of the brake system.