Ans: If your new brake pads aren't effectively stopping your car, there could be several reasons. Firstly, they might need a "break-in" period to reach their full braking potential. Secondly, improper installation or contamination on the pads or rotors can hinder their performance. Lastly, it's possible that other brake components, such as the calipers or master cylinder, may require attention. It's essential to have a professional mechanic inspect and address the issue for your safety.