The contact owns a 2010 Mercedes-Benz E350. The contact stated while the contact’s wife was driving at an undisclosed speed, the brake pedal was depressed, however, the vehicle failed to stop as intended. The contact’s wife was able to stop the vehicle from crashing into a concrete curb. The contact stated a nearby independent mechanic assisted the contact, and the vehicle was taken to the independent mechanic. The vehicle was diagnosed with a fractured brake line due to corrosion. The contact was advised to have the vehicle towed to the dealer. The vehicle was towed to the dealer where it was diagnosed with a fractured rear brake line due to corrosion. The contact was informed that the rear brake line needed to be replaced. The vehicle was not repaired. The contact stated that a year ago the rear subframe fractured due to corrosion. The contact stated that the rear subframe was repaired under an unknown recall repair. The manufacturer was made aware of the failure. The contact was advised to contact the NHTSA Hotline and report the failure. The failure mileage was approximately 140,000.