Final answer:
Technician A is correct about the use of cables in parking brakes, while Technician B is mistaken since many parking brake cables are adjustable and do not always need replacement when the brake is ineffective.
Step-by-step explanation:
Technician A is correct in saying that most parking brake systems use a cable to connect the parking brake lever or pedal to the braking assemblies. This traditional system allows the driver to engage the parking brakes manually, which typically act on the rear brakes for safety and stability. On the other hand, Technician B is not entirely correct. While some cable systems are designed to be nonadjustable, many modern vehicles come with adjustable parking brake cables. The cable tension can often be adjusted to ensure that the parking brake continues to work effectively as components wear out over time. Only when adjustments cannot restore the proper function or if the cable is damaged, should it be replaced.