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

If the brakes are continuously squeaking, the brake pads themselves might be completely worn out and do not have any remaining friction material. This causes the steel rotor to make contact with steel pad thus causing the squeaking sounds.