2002 Mazda Protege front end

Frontend sounds like a roller coaster.... Pulls to the left, sounds like a humming wobble.. The noise seems to get worse as you hit 40mph I do notice a slight humming when turning at a slow speed.. Sometimes when I step on the brakes when I'm turning I sometimes hear like a pop and a click in the brakes. It's not the tires as they are both new......Could please tell me what this could be, and how much would it cost to repair....Thank You!!!