What is the proper method for verifying that the foot brake pedal has not lost hydraulic integrity before driving?

1. Press the brake pedal firmly while stationary; it should feel solid and stop well above the floorboard without slowly sinking under continuous pressure
2. Check if the brake pedal can be wiggled horizontally by hand
3. Press the brake pedal with the engine off until the horn sounds
4. Check that the pedal touches the carpet freely