At about 47,000 miles, i began to hear a growling, grinding, shaking sound while stopping on highway during high speed. i began to notice it at regular stopping speed. i thought it was brake pads. however, going to three shops. it was determined brakes were not the problem. i t was the left front wheel bearing. at such low mileage and regular wear, i believe it to be a manufacturer's defect. please advise.