What does Technician A observe when road testing brakes that could indicate issues?

When road testing brakes, a sinking brake pedal can indicate a problem related to the brake system, such as a fluid leak, air in the brake lines, or worn components. A sinking brake pedal suggests that the hydraulic pressure may not be effectively transferring force from the brake pedal to the brake components. This often results in decreased braking efficiency and can compromise vehicle safety.

Observing a sinking brake pedal during testing is critical because it typically signifies that the braking system is not performing as it should, prompting further inspection and diagnosis. Proper brake function relies on a firm pedal feel when pressure is applied, so any deviation from this standard can indicate underlying issues that need to be addressed.