1999 Pontiac Grand Prix brakes problems

When traveling on snow pavement surface and upon depressing brake pedal, rear brakes locked up, causing vehicle to go into a skid, resulting in vehicle rolling down into a ditch and hitting a tree. Upon impact, neither driver's side nor passenger's side air bag deployed also there was an excessive amount of front end damage to the vehicle. Consumer has contacted manufacturer. Please provide any further details.

Tl*the contact owns a 1999 pontiac grand prix. While backing out of the driveway at approximately 5 MPH, the vehicle failed to stop when the brake pedal was depressed. The vehicle slowed down; however, the contact had to apply the emergency brake in order to stop the vehicle. The vehicle was towed to a mechanic, who stated that the brake line was rusted. The current and failure mileages were 51,000. Updated 11/12/08. Updated 11/14/08.