That's because they're doing the same things to the rotor at low temperatures that a caliper does - just abrading away rotor material to slow the car. Track pa

That's because they're doing the same things to the rotor at low temperatures that a caliper does - just abrading away rotor material to slow the car. Track pads are great when hot, not so amazing when cold. Yes, I know there are plenty that claim to be able to do everything, but your rotor life will suffer. However, it's not something one should expect from a factory vehicle - and if you've installed higher performance track pads yourself, you should be able to determine if it's normal. Also, they'll sound the same from all four corners - this sound just came from one corner.