The squealing sound in brakes is caused by dust and dirt in the brakes. Also, more commonly, it is caused by worn pads or shoes. On disk brakes there is a wear indicator. This will rub against the disk and squeel when brake pads are worn to where they need replacing.
Check the brake pads for wear. There is a metal tab attached to the pad so as the friction material wears out the tab contacts the brake rotor and it makes a squealing sound but as braking is applied the pressure on the brake pad causes the noise to stop.
You can't, after a while the sound will go away.
The squealing sound you hear when your car brakes are wearing out is referred to as a "squealer." This indicator is a strip of metal that when the brake pad wears down makes contact with the rotor making a metal on metal noise.
A hog sometimes makes a snorting sound, and sometimes makes a squealing sound.
High pitched squeaking/squealing. like your dragging a knife harshly across a stainless steel sink.
Dust, unevenness.
They might be making squealing or scratchy noises when you brake
When the brake pads are worn the rivets will actually touch the brake rotor when the brakes are applied. The brakes should be changed immediately.
loose fan belt, or low power steering fluid. Depending on the sound, it could also be the brake pad wear indicator.
check the belts
The cause of the squealing sound is because you are turning the steering wheel completely to the right or left
Squealing from the engine (ie; it alters according to revs applied) would suggest a belt is slipping somewhere. Squealing that varies according to road speed suggests that the is metal contacting on metal. If it is when you brake, I know that some Korean cars have brake pads that squeal when they are worn to the point of replacement. I had that happen to me on a Kia once, and it scared me witless to start with!