Your mom always told you that blasting music in the car wasn't good for your ears. Well, it's not good for your brakes either.
That's because one of the warning signs that your brakes need servicing can come from a small indicator in your braking system that emits a high-pitched squeal when your pads need replacing. And, while this sound is loud enough to be heard even when the windows are up, it might be tough to hear with Lady Gaga blaring from the stereo.
In addition to the squeal from the sensor, you'll also want to listen for a harsh grinding sound. This means that you've gone completely through your brake pads and now, when you apply the brakes, the metal of the calipers is grinding against the metal of your rotors. Not only is this an ineffective way to stop your car, chances are good that you'll also damage your rotors, thus turning a relatively easy and inexpensive pad job into a more costly rotor resurfacing or replacement ordeal.