What could be a sign of brake issues when applying brakes during an exterior inspection?

A sign of brake issues during an exterior inspection is the presence of unusual sounds, such as squeaking or grinding. These sounds can indicate a variety of problems, including worn brake pads or contaminated braking surfaces. When the brake pads wear down, they can produce a squeaking sound as the metal wear indicators make contact with the brake rotor. If the pads are excessively worn, grinding noises may occur as metal components come into contact with each other, leading to potential damage to other brake components.

Listening for these unusual sounds is crucial during an exterior inspection because it provides immediate feedback on the health of the brake system. Catching these issues early can prevent more severe damage and ensure safety while driving. Other options, while potentially related to drivetrain or vehicle performance issues, do not directly relate to the immediate auditory signs of brake performance.