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!