Ok so back when i bought my car ( many of you know used ) i couldn't tell if it had original pads ( im sure it did only 22k on it when i got i), but after a while i would get these annoying squeaks and they just progressively got worse. So last week i was fed up and went to buy brakes and changed them, my rotors seem fine perfect really smooth still so i didnt change those out. The pads i got were not from hyundai made by another company BUT OEM material so they were just like the originals just by a different company.Well changed them out and car felt GREAT stopping power felt way better. Tonight when i was on the interstate 15 with my girlfriend and some idiot in front of us decides to slam on his brakes for ABSOLUTELY NOTHING so of course i had to jam on mine and sonata immediately reacted which was good so switched lanes got away from that person and went on my way but had to hit my brakes again shortly after and got this rumble from left and right and thought to myself WTF is that. The steering wheel doesnt shake at all just makes this rumble noise and it does not do it all the time (seems to only do it when i have to hit the brakes hard), once i kept driving and used my brakes again the car was fine so im trying to think of what it could be. Are the pads sticking or what could it be????? any opinions would help because i dont know what to do. Also get this popping noise when i hit the brakes at very low speeds like when going forward in a drive threw that started before i changed the pads.