Could be worn out brake pad on that side is grinding metal to metal. They usually last longer than that, but if you use the brakes much more than average, it could be added wear that shortened the life. Another thing it could be is the inner fender shield being loose and out of place, contacting the wheel. You can see that if you look in the wheel well. Take off the wheel and look at the brake rotor; It should be smooth and flat, with no grooves. If it looks rough or has grooves deep Go on and have it replaced along with a new set of brakes. The front brakes last about half as long as the rear brakes, which should still have lots of material on them. Have them checked anyway. If they're only half worn, don't bother changing them, but check them again after next summer. Have them adjusted.