What is a common sign of brake trouble?

A common sign of brake trouble is the presence of a grinding or squeaking noise when the brakes are applied. This sound often indicates that the brake pads have worn down to a point where the metal backing is rubbing against the brake rotor, which can lead to further damage if not addressed. The grinding noise signifies that the brake pads may need replacement soon to ensure safe stopping power and to avoid costly repairs to the brake system. Squeaking can also suggest that dust or moisture has accumulated, or that the brake pads are nearing their wear limit, making it important to have the braking system inspected regularly.

The other options may indicate different issues in the vehicle but are not directly related to brake trouble. Vibration in the steering wheel can suggest problems with the wheels or suspension rather than the brakes. Increased fuel consumption typically relates to engine performance or driving habits. Unusual smells from the exhaust may point to engine or exhaust system issues but does not indicate a problem with the braking system.