Last month i was visiting family in a different staye and I started hearing a small squealing so I took my car to a break shop since i had to leave that same day and it is about a 600 mile drive back home. He said I had barely anything left on my pads and replaced them for me since it was sunday and all dealers were closed. He said he has done these cars before and has had no problems so I was placated. Fast forward a month and the I can now hear a pretty loud squealing from the brakes but it sounds like its mostly just coming from my front left side but that may be just because thats the one im close to. The weird part is its only at certain speeds when im slowing down maybe at around 25-15 mph and never at high speeds or very low speeds but when it hits the sweet spot it is very loud. Any ideas what this might be caused by? Im scared to take it to the dealer since I dont want them to try and void the warranty on my brakes at least or charge me huge to replace them. Thanks and sorry for the wall of text.