No no... cars today don't have 100% electric brakes..
they still have hydrolic brakes with the AID of electronic solenoids etc....
IF your entire brake setup was electric, and the battery went dead, your saying push the pedal harder?? ummm.. no.. if it's electric and "throttle by wire" or simply hooked up to electrical wires to a solenoid, I don't care how hard you push, the solenoid will NOT move... it's electricity that moves the solenoid.
But yes.. even a VW Passat for example has an electric e-brake and cars with ABS have .. thats right.. electric aid...
So a car with NO hydrolic system, and entirely electric brakes would be awful.
Magnetic brakes on the other hand ... *hmm*