Final answer:
In a hydroboost system, pressurized power steering fluid is used for both the power steering system and the power brake booster.
Step-by-step explanation:
In a hydroboost system, pressurized power steering fluid is used for both the power steering system and the power brake booster.
The power brake booster is a device that uses the hydraulic pressure generated by the power steering pump to assist in the braking process. It amplifies the force applied to the brake pedal, making it easier to stop the vehicle.
Therefore, the correct answer is option b. power brake booster.
Learn more about hydroboost system and its components