My blogging on timing belt repair
Grinding or growling metal on metal sounds mean that your brake pads are completely worn away. Don't put off brake repair if any of these signs appear. Experts strongly recommend that the problem be addressed before it gets any worse. They also recommend regular annual brake inspections, twice a year if you use your vehicle for heavy hauling or towing. You should also have your tires rotated every 5,000 or 7,000 miles to maintain even contact with the road.