There are a few signs that indicate you should replace your brake pads:

1. Brake warning light: If your car has an electronic system for monitoring the health of its components, then there is a chance you will see the brake symbol illuminated when maintenance is needed. Note however, some older cars may not be equipped with such systems and therefore require drivers to regularly check their condition.

2. Screeching noise from wheels during application: Typically caused by metal grinding against one another (your piston pushing through your caliper rubbing against your disc), these noises can get gradually worse overtime until a full replacement becomes necessary due to excessive damage.

3. Vibration experienced while driving at high speeds or suddenly hitting the brakes: Caused primarily because both your brake pad material is completely worn out, leaving behind nothing but thin pieces of metal which now serve as what used to function as friction surfaces. As a result this could also cause heat buildup when trying to decelerate quickly, eventually triggering the anti-lock feature built into most modern automobiles.
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