Car tires may squeal for a number of different reasons, including under-inflation, extreme tire wear and poor wheel balance. Proper tire maintenance can alleviate squealing.
It is easy for even the most inexperienced driver to check tire health. Tire gauges help to measure the amount of air in the tires and the amount of air a tire needs is listed on the outside of the tire. To check the tread on a tire, simply insert a penny into the center groove of a tire. If the president's head is all or partially covered, the tire tread is at an acceptable level.
When in doubt, it is always best to seek the advice of a mechanic.