1999 Dodge Ram 1500 brakes problems

While appempting to stop the brakes did not stop the vehicle (vehicle has anti-lock brakes on rear wheels only), the seat belt did not hold the passenger causing him to move forward and hit both knees on the dash, the seat belt grabbed yanking passenger back into door and the passenger hit head on the window, air bags also failed to deploy. Nlm

Tl* - the contact owns a 1999 dodge ram 1500 truck. While driving at 50 MPH the brakes failed. The mechanic advised him that the hydraulic lines rusted, and the entire braking system must be replaced. There were no warning indicator lights before or after the incident occurred. 50 miles prior to incident the vehicle passed safety inspection. A year ago while leaving his driveway a bolt for the steering idle arm fell off the vehicle. The rusted brake area was not exposed and rusted near the gas tank.