Hey guys. this started about 2 weeks ago. sometimes when i get on the brakes a little heavy, the car pulls to the left. not too bad, but to the point where if i didnt expect it, i might lose control. i changed the rotors and pads on both sides in the front. stops better but still pulls. the calipers seemed to move in and out fine(worked it with a c clamp), could there be a blockage in one of the lines? could this be one of the rubber lines swelling anf not allowing fluid thru as easily? or is this something more serious, like the master cyclinder? I am not loosing any brake fluid if that helps also.