If your vehicle's foot brake pedal suddenly drops completely to the floor with total loss of hydraulic braking, what emergency sequence should you follow?

1. Jump out of the moving vehicle immediately
2. Pump the brake pedal rapidly to rebuild residual pressure, downshift through gears sequentially to use engine braking, and gradually apply the handbrake while steering safely
3. Turn off the engine, remove the ignition key, and close your eyes
4. Accelerate to find a clear stretch of grass