WHEN TRAVELLING AT 30 MPH, THE REAR END JERKED, SPARKS FROM THE RIGHT REAR WHEEL. WHEN STOPPED, THE RIGHT REAR WHEEL AND DRUM WAS MISSING. DEALER CONTACTED, AND COULD NOT DUPLICATE THE PROBLEM. REPAIRS MADE AT CONSUMER'S EXPENSE. MECHANIC DIAGNOSED PROBLEM AS A DISINTEGRATION OF WHEEL BEARINGS. *AK