Hachi

Due to a leakage issue with the Teves MKII brake unit of my Chrysler TC, I purchased a used unit and a local auto repair centre here in Germany installed the unit in the car. The unit is leaktight now and the brake as such and the booster work. However, the two brake lights in the instrument panel turn on when you push quickly the brake pedal. The lights turn off again when you release the brake again. Also, there seems to be no clear pressure point when the brake is pushed. Finally, the ABS does not work. Any help and comments on the possible reason of these faults and how to solve this would be appreciated.