what is that squealing noise coming from my rear end

Hello, get another opinion from a reputable shop near you. This sounds crazy. Perhaps it's true, but if the problem only started after having a new brakes installed, I would be focusing my attention on the brake pads at the mating surface to the brake rotors, as well as any anti-rattle clips or unintended movement in the brake caliper brackets. This is the most likely cause of squealing. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops