Originally posted by gillybenztech
Precharging means that if the system detects your foot coming off the throttle rapidly, the brake system will bring the brake pads out just to the rotor, to be able to apply more rapidly when the brake pedal is depressed (not until you step on the brakes will they actually apply).
There is also a feature called "Softstop" which reduces the "jerk" you feel at the end of a stop.
One reason why twin-piston (or 4-piston or higher) brakes with fixed calipers/floating rotors are superior to those with single-piston/floating calipers/fixed rotors is that both sides of the rotor are engaged more quickly than with single-piston/floating caliper design (with single-piston/floating calipers, the rotor surface on the piston side of the caliper is engaged first, and as the caliper slides, the other surface is then engaged).
With "precharging", you can get superior brake response without requiring the (more expensive) fixed caliper/floating rotor design.
And that "softstop" feature is really neat. But then again, the skill of doing a softstop manually will also become a lost art - it's one of those subtle skills for smooth driving.
But one of the biggest advantages of e-brakes is that it is the ideal setup for traction control and stability systems, where individual wheels have to be braked.
They said that they removed the "pulsing" of the ABS, primarily because the reaction of the majority of drivers when they sense this is to ease up on the brakes (and hence the need for Brake Assist). But this is precious feedback for the driver.
they better have wiring harnesses better than those in the 94-95 W124s. You don't want electrical shorts in this one ...