How do breaks squeak if/when they need to be replaced, but do not squeak when working normally.

Question

My breaks on my car started squeaking and I know that means I need to replace them. I’m just wondering how the mechanical system works.

In: Engineering

Answer 1

There’s something built into the break pad so that once you’ve worn through the good part of the pad it starts making noise… kind of like how on receipt paper in registers, you’ll see blue line when it gets near the end of the roll.