When our 2012 Sportage started making a squealing noise, we had no idea what was causing it. It seemed to me that maybe a pin hole had formed in one of the many hoses that adorn the engine compartment.
However when we eventually realised that it was the brakes (it made a grinding sound when the brakes were applied,) we took it to a brake man who then had to replace both the rotors and the pads. I do not know what percentage is left on the pads when the squeal starts but I can almost guarantee that you will need to replace the disc rotors as well.
Good luck.0
