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When you step on the brakes in your car, the pads compress against the spinning rotors and slow the car down. But it’s not just the pads that do the work – the rotors play an important role as well. As the pads squeeze against the rotors, they create friction. That friction causes the rotors to heat up, and as they heat up, they expand.

The expansion isn’t uniform, though, and that’s what causes the rotor to warp and the brake pads to vibrate. The vibration is what causes the squealing noise you hear when you step on the brakes.

There are a few things you can do to reduce brake noise. First, make sure your brake pads are properly aligned – misaligned pads are a common cause of vibration. You can also try upgrading to quieter brake pads. Some brake pads are designed to be quieter than others, and they may have a special coating that dampens noise.