Brake Grinding Noise problems of the 2007 Honda CR-V

The contact owns a 2007 Honda Cr-v. The contact stated that the vehicle pulls to the right and makes a loud grinding noise when driving in reverse. He took the vehicle to the dealer three times for the failure and they changed the brake oil differential and suggested that the oil be changed every three to four thousand miles. This corrected the failure temporarily, but the grinding noise recurred a week later and the vehicle began pulling to the left again. A report was filed with the manufacturer and they stated that a representative will inspect the vehicle. The vehicle has not yet been inspected. The failure mileage was 21,804 and current mileage was 92,000.