1. Braking distance: Reduced brake pad performance may lead to an increase in braking distance, that is, an increase in the distance required from the start of braking to the complete stop of the vehicle.
2. Brake pedal feedback: When the performance of the brake pads decreases, the brake pedal may become softer than usual, or give people a "hollow" feeling, and the feedback strength is unclear.
3. Brake noise: Reduced brake pad performance may result in harsh brake noise, or a "hissing" or "squealing" sound.
4. Brake thermal fading: During continuous braking or long-term braking, braking performance may decrease due to overheating. If you find that your brakes are not as effective as they first were, it may be due to thermal decay of the brake pads.
5. Brake disc wear: Decreased brake pad performance may lead to faster brake disc wear because the brake disc needs to be in closer contact with the brake pads to achieve the same braking effect.
These are just some common indicators for evaluating brake pad performance degradation. The best thing to do is to have your brake system inspected regularly to make sure your brake pads are in good condition. If you suspect there is a problem with the brake pads, it is recommended to replace them in time.