we need to start with getting the computer scanned for trouble codes. Most parts places will scan for free. You may have an abs sensor issue.keep me posted so we can continue to diagnose.
If they scan they might charge and hr labor and depending on the fix, like if a hub bearing/abs sensor maybe 1.5 hrs and 400$. You are just out side of 3/36, ask for goodwill if it is the front bearings. These go often. What ever it is ask for goodwill, people don't ask and don't get help. GM wants you to buy again and they are desperate now. I have seen them pay for all or part on many repairs out side warranty.