i have a 2005 pontiac grand prix and when i go to brake it makes a loud screeching

You probably have 'brake wear'. Check if there's a light lit up on the dash that says 'brake wear'. This means that the brakes no longer have a good grip on the metal plates they grab when you brake. This can result in your car making jerking movements or noises like you said. I'd suggest you get new brakes.
 
its probably your brake wear indicator, check your dashboard and see if i light that has to do with brakes comes on, if so, id replace the brake pads, if that doest help, replace the rotors too. good luck, hope this helps
 
Well is it all the time? Or maybe after it rains brakes screeching after rain is common because the rotors get wet. But if it's all the time you more than likely need new brakes.
 
Hopefully this has only been happening recently cause if you wait too long then you might need to resurface your rotors before you change your brakes. Good luck laterz
 
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