How can you tell if your brake pads are worn?

Listening for a grinding noise when braking is a reliable indicator of worn brake pads. When the brake pads wear down beyond a certain point, the metal backing of the pads can come into contact with the brake rotor, resulting in a distinct grinding sound. This noise alerts the driver that maintenance is required immediately to prevent further damage to the braking system and ensure safe driving.

The other options do not directly indicate brake pad wear. Checking the brake fluid level provides information about the hydraulic system's integrity but does not specifically indicate the condition of the brake pads. Inspecting tire tread concerns tire condition and traction, not brake pad wear. Similarly, feeling vibrations in the steering wheel could suggest issues with various components of the braking system or suspension but is not a definitive sign of worn brake pads.