No, this is not another system, where by increasing the amount of electronics, additional functions are gained. It is absolutely necessary to use an electric motor to ensure that the full braking power is available. Consider the energy-situation up to now. Because the Diesel engine doesn't generate enough vacuum anyhow, it always has an additional vacuum pump. It takes a lot of effort, to gain pneumatic energy from the engine and to have it efficiently, go through a large container on the increasingly small master brake cylinder.
Indeed, if that's not enough. The petrol engine also shows it's weakness, when it comes to producing a vacuum. It isn't particularly popular as far as the production of high efficiency is concerned anyhow. If in fact, there is a variable valve control, it just disappears. In certain operational areas, E-Gas also generates too little vacuum. In this case, a vacuum pump would be an advantage. Indeed, what about coasting?, when the engine is not being used. Where does the boost then come from? Do you know how much force is necessary, to get your brakes to work efficiently without power assistance? Don't even try it out!
At the latest, with hybrids or purely electric drives, an brake-assistance which is independent of the engine is necessary anyhow. This obviously means, the installation of an electric motor with a suitable gearbox. Where lately, the independent initiative of the brakes has increased a great deal. In the beginning, it was quite harmless, where a too soft pressure on the brake pedal was to be boosted. In the meantime, a possible emergency braking can take place at up to 30 km/h. In trials, they are already at 60 km/h.
So, there is no way past the electric brake booster. Particularly in view of the fact that energy should be dilligently recovered. The master brake cylinder is already integrated and one can speculate, how long the ABS/ESP system will still remain independent. Why pump it awkwardly back again, where the speed of the new systems has been so much increased? Already today, the excessive high pressure is not reduced any more, it's simply no longer generated in the first place.
You need not be afraid of a possible breakdown in this type of system, should the electrics collapse, the brake pedal is still connected to the wheel-brake, even though, in case of an emergency, you would have to press the brake pedal much harder. It would appear, that it will still take some time before the brake pedal activates a sensor which will give out a signal to develop the necessary brake force. We'll keep you informed (hopefully) in good time! 07/13