you might need a new belt I've got a old Jeep that needs one and it squeals when you get up into higher rpms
At least inspect when you hear squeal. Base further work on what you see.
hypothisies
hypothisies
have your brakes checked
Friction
THE ONE TO THE LEFT
The brake pad "squealers" are telling you to have the brakes checked.
Bad logic
theory
well it stops the car no durf
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.
Conservation of energy. The energy from the moving car is transformed into heat by the action of the brakes.