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 a little piece of metal that sticks up next to the pad called a chirper, and when the pad gets short enough for the chirper to touch the rotor it makes the squeaking.