2004 Chevy Malibu making bad loud screeching noise whenever my car is in reverse?

For two or three days my car has been making a very bad screeching noise when I put it into reverse. Once I let the brake go and i'm reversing it makes the noise and it makes it even worse when I push on the brake to go into drive. It used to screech badly whenever I pressed on the brakes in drive but now it... show more For two or three days my car has been making a very bad screeching noise when I put it into reverse. Once I let the brake go and i'm reversing it makes the noise and it makes it even worse when I push on the brake to go into drive. It used to screech badly whenever I pressed on the brakes in drive but now it rarely does that anymore. What could this mean?
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