Hi I just bought this 02 protege5 and the front brakes seem to be dragging. it seem to be most of the time but not all the time. the steering is not pulling right or left. you can feel it slowing down the car. the front rims get warm to hot. the calipers move freely when the pistons are backed out. none of the hoses are pinched or damaged. the brake fluid reservoir is full. any ideas where to start looking or possible causes?