Final answer:
The passenger car braking systems are predominantly equipped with vacuum brake boosters.
Therefore, technician A is right.
Step-by-step explanation:
Technician A is correct; passenger car braking systems are predominantly equipped with vacuum brake boosters. These boosters utilize the engine's vacuum to amplify the driver's pedal force, making it easier to brake.
On the other hand, some heavy-duty vehicles—as well as power brakes and those in bulldozers—may have a motorized pump as part of the system, but this is less common in passenger cars.
Technician B's assertion that passenger cars are predominantly equipped with Hydraulic brake boosters is less accurate for standard passenger vehicles. However, all car braking systems use the principles of hydraulics, as detailed by Pascal's principle, to operate effectively.
For example, when the driver pushes the brake pedal, the force is amplified by a lever and then further by the hydraulic system to the wheel cylinders.