Car was acting normal, just took a 200 mile round trip, the next morning the roads had some snow and a bit of ice. i backed out of the driveway and drove on the side streets (2 blocks) to the highway, as i was driving down the highway i began to feel a drag, i shut off my radio and listened soon my tire gage came on so i looked in my mirror and seen sparks flying, i pulled over immediately at an available safe location only to find my rear drivers side tire was shredded. i changed the tire and began to drive again, once i hit dry pavement i heard a screeching noise. called for a tow truck. the gm dealer called me today and said my parking brake was locked up. my car is an automatic and i have never engaged the parking brake (have owned the car over a year). the dealer is now telling me the parking brake line was off and shredded . they also stated the tire was not going to be covered under warranty and the brakes may not be either since the line that apparently locked one side of parking brakes up could have just fallen off and locked one set of parking brakes up which have never been used. *tr