Final answer:
Technician A is correct, as a spongy or low brake pedal can indicate a hydraulic brake problem. Technician B is not correct, as high-pitched scraping noises are more likely to indicate a problem with brake pads or shoes.
Step-by-step explanation:
Technician A is correct. When a driver presses the brake pedal, it should feel firm and consistent. If the pedal feels spongy or goes all the way to the floor, it could indicate a hydraulic brake problem. This can be caused by a leak in the brake system or a loss of brake fluid. It's important to have this issue inspected and repaired by a qualified mechanic.
Technician B is not correct. High-pitched scraping noises are more likely to indicate a problem with the brake pads or shoes, rather than the brake lining. The brake pads or shoes can become worn over time and may need to be replaced if they are making scraping noises. It's best to have a professional inspect and diagnose the issue to determine the exact cause and recommend the necessary repairs.