Knowing how to tell if brake pads are worn can prevent costly damage and keep you safe. Here are the signs to watch for.
Listen for Noise
The most common sign of worn brake pads is noise. Most pads have a built-in wear indicator that makes a high-pitched squealing sound when the pads are thin. This sound is intentional. It tells you the pads are getting low and need replacement soon. If you hear a grinding or scraping sound, the pads are completely worn. The metal backing plate is contacting the rotor directly. This damages the rotor and costs more to repair.
Check the Thickness
Brake pads start with about 10 to 12 mm of friction material. When the material is down to 3 to 4 mm, it is time to replace them. You can check the thickness by looking through the wheel spokes at the caliper. The outer pad is visible without removing the wheel. If the pad looks thin, inspect the inner pad too. Inner pads often wear faster than outer pads.
Feel the Brake Pedal
A vibrating or pulsating brake pedal can mean the pads are worn unevenly or the rotor is warped. A soft or spongy pedal may indicate air in the brake lines or a fluid leak. Longer stopping distances also suggest the pads are worn.
Visual Warning Signs
Brake dust on the wheels is normal. But excessive dust combined with noise suggests the pads are wearing quickly. If you see deep grooves or scoring on the rotor surface, the pads may have worn down to the metal. Replace worn pads promptly to avoid rotor damage and maintain safe braking.
