MEV 02 UI is a city car-type vehicle as a program for converting the conventional vehicle into the electric vehicleat the Universitas Indonesia. In the brake system, the booster component still uses the Vacum Brake Booster. Vacuum type booster brakes require air vacuum generated by the engine intake manifold. Electric vehicles do not have anengine to create a vacuum in the intake manifold because they usean electric motor. Type of vacuum brake booster on electric vehicles used, it is necessary to have an additional vacuum pump component. The use of a vacuum pump requires an additional electric power of 1200 Wh. The existence of a vacuum pump requires an additional space of 0.25 m × 0.15 m × 0.15 m. This study aims to design a new mechanism for a booster type Solenoid Brake Booster as a substitute for a type of vacuum brake booster mechanism. The method used in this research is to analyze the related braking force on the City Car MEV-02. Furthermore, analyzing the force generated by the type of vacuum brake booster as an initial reference for designing the Solenoid Brake Booster design. The design of the Solenoid Brake Booster construction mechanism is designed using CAD software. Solenoid brake booster design uses a magnetic force generated by the solenoid coil, which pulls the lever rod connected to the brake master. The brake pedal that is stepped on by the driver activates the flow of electricity in the solenoid and activates a magnetic force so that the solenoid brake booster mechanism will assist the driver force in stepping on the brake pedal. Unlike the previous research, this research resulted in a solenoid brake booster design with only 94.07 Wh of battery power.