How can the driver detect that the brake pads are worn?

Question

DentroTest · Accepted Answer

The correct answer is that abnormal noises are heard when braking. This happens because many brake pads feature an acoustic wear indicator (a small metal tab) that rubs against the disc when the friction material wears down, creating a high-pitched screech to warn the driver. If the sound is a grinding metal-on-metal noise, the wear is critical. Why the others are incorrect: A 'spongy' pedal usually indicates air in the hydraulic lines or deteriorated brake fluid, not necessarily worn pads. If the car pulls to one side, it is usually due to incorrect tire pressure, poor wheel alignment, or a seized brake caliper, but it is not the primary symptom of worn pads.

How can the driver detect that the brake pads are worn?

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