[Esel Mann]

To my knowledge, there is no production vehicle available in the show rooms with braking or steering by wire. Both are direct with hydraulic assist (that way if the hydraulic assist were to fail one could still albeit with difficulty steer as well as brake.

Even if you cannot turn the ignition off, even if you cannot get the throttle to work, even if you cannot put the car in neutral, you still have the brakes (both main and parking) and steering. Granted in some situations the hydraulic assist may be down, but nevertheless both are still available.

Steer by wire and brake by wire are both possible. In fact they are in development right now. If anyone knows of a specific production vehicle with either brake or steering by wire and is available to buy from a show room, please do share!