Extremely well cared for vehicle - always serviced at gm dealership, and recently safety state inspected. brake line ruptured under truck cab leading to rear wheels. complete loss of brake pressure. complete loss of brakes. inspection of brake line at the frame where rupture occurred reveals all lines leading to the rear of the vehicle are so corroded and rotten that i should be grateful this didn't occur at highway speed, otherwise, i would not be making this complaint. this failure should not be happening to a vehicle of this age and mileage. *tr