There are probaby many reasons but one that I know of is anti-freeze. If some anti-freeze gets on the belt it can cause a squeak and it's hard to get rid of it without replacing the belt.
Probably due to slipping when they get wet. Your belts might need to be changed.
The friction between 2 objects makes them squeak
This is almost always caused by worn drive belts. Replace all the belts at the same time. If it has a serpentine belt, then replace it. Be sure and check the idler pulley to make sure the squeak is not coming from the idler pulley itself. Another possibility is a bad alternator, water pump, or power steering pump. Check them all.
The AC belts are probably stretched and loose. I had the same problem and replaced belts and cured squeak.
Put a small dab of clear dialectic grease on both sides of the belts and the squeak will go away.
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I think it is because when you brake and turn at the same time it makes friction and that's what makes the tires squeak.
it makes a loud squeak
It might be one of your belts. Check the inside of each belt (the part that contacts the pulleys) for shininess or cracking. If the belts are okay, then check and/or tighten the tension. Steven
Dave Millican Belts