Brake pad/lining dust can often be the cause of brake squealing when brakes are applied. This is normally remedied by blowing dust out with compressed air.
If your rotors are warped or uneven, this will make a squealing sound. You may need to have your rotors turned or replaced.
I would check two things immediately...brake wear being the first, as most pads are now equipped with "sensors" that contact the spinning rotor to create a reminder squeal. Change the brakes at this point. Second thing would be brake dust as mentioned above, HOWEVER, it is not good practice to blow brake dust with anything. At this point, the rotors must be resurfaced to remove the "glaze" caused by heat and friction to their surfaces. Remember, when resurfacing rotors, or drums, replace all pads and shoes.
Some occasional squealing can be a normal characteristic on many vehicles. Also, if you tend to let the car sit without use for days at a time, learn to live with the squeal. A few drum brake systems (Neon rear drum brakes are of note) have a design that is inherently squeaky.
Disc brakes:
Drum brakes:
If you're using low quality brake pads switch to a better grade.
"Squealing" is usually from the belt or brakes. use belt conditioner to stop a squealing belt.(usually sold at walmart) you can probably figure out how to stop squealing brakes. but if not they need to be replaced. people need to start reading those owners manuals the car comes with.
Have the brakes checked.
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.
If they believe that your brakes are unsafe, they can stop you and force you to get an inspection. I don't think that they legally have a leg to stand on ticketing you for your brakes being loud. On another note, if your brakes are squealing, odds are that you need new pads and if you wait too long, you will need rotors as well. Change them before it costs you more.
You should have your brakes cleaned! Or have a mechanic look to make sure nothing is wrong. My neon does this and after driving a while it stops. Sometimes rust,dust and dirt particals get on the drums !!
check your wheel bearings
Brake squealing is commonly caused by worn brake pads. The metal part of the pad makes contact with the rotor, causing the noise.
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.
Get the widest, stickiest tires you can and it will pull harder without squealing.
You can try but the squeal will probably come back. Brake squeal is usually due to cracked, glazed, contaminated or inferior brake linings.
Brakes most likely
If your car makes a squealing sound when you are turning it is because your brakes have worn out. When the brakes wear down below a certain point, a wire pops loose. That makes a squeaking sound.