Grinding - Stop driving! Usually caused by a lack of brake pad.
Thumping from rear - Hard to diagnose, but usually the rear drums.
Squeaking - Either cheap brake pads or break wear indicator is hitting rotor.
Thumping or squealing - If car is parked outdoors, probably caused by rusted rotors.
Scraping - You may have picked up a rock.
_______________________
http://www.manassaslimo.com/