Squeaking brakes

If you mean that the car squeaks while you are just driving then you need to return it to the mechanic and check your brakes again.  If you mean that it squeaks when you apply the brakes,  then you might want to go to another mechanic to check it out.

New brakes tend to be noisy for a lil while after getting them replaced - drives me nuts honestly. If yer car is making noise without you hitting the brakes, then you have a serious issue - get it checked out NOW, trust me, been there, done that...900 dollars later I just got rid of the vehicle.