Poor braking performance can be a safety concern in vehicles. Brake pads play a crucial role in the braking system by providing friction to slow down or stop the vehicle. If the brake pads are worn out, damaged, or of low quality, they may not effectively generate the necessary friction, leading to reduced braking efficiency. 

Here are a few signs that could indicate poor brake pad performance: 

Reduced stopping power: If you notice that your vehicle takes longer to stop or the braking distance has increased, it could indicate worn-out or ineffective car brake pad. 

Squealing or grinding noise: Brake pads often have wear indicators that produce a high-pitched squealing noise when the pads are worn down. Additionally, a grinding noise may occur if the brake pads are completely worn, and the metal backing is in contact with the brake rotor. 

Vibrations or pulsations: If you experience vibrations or pulsations in the brake pedal when applying the brakes, it could be a sign of unevenly worn or damaged brake pads. 

Longer brake pedal travel: If you notice that the brake pedal feels spongy or has increased travel before the brakes engage, it might indicate a problem with the brake pads or the braking system. 

If you suspect that your car's brake pads are not performing optimally, it's essential to have them inspected and replaced if necessary. Regular maintenance and periodic inspections of the brake system can help ensure the safety and effectiveness of the braking system. It's always recommended to consult a professional mechanic or automotive technician for a thorough evaluation and any required repairs or replacements.