At least inspect when you hear squeal. Base further work on what you see.
hypothisies
hypothisies
have your brakes checked
THE ONE TO THE LEFT
Friction
The brake pad "squealers" are telling you to have the brakes checked.
theory
Bad logic
Your brakes are telling you they need replacing soon. They have a built in "squealer" designed to make a noise when the pad wear is nearing the end.
If the brakes works it will stop UFDA
Brakes on any car car squeal or squeak for a variety of reasons: 1. Very hard brake compound. (Metallic Compound Pads) 2. Worn out Pads with a wear indicator device. 3. Foreign material on the rotor or pad. 4. Anti-squeal material not used when Pads installed. If you changed the Pads yourself, did you use the anti-squeal paste? Either check the brakes yourself for items 1 thru 4, other take the car to a mechanic for a brake check.