Manual Transmission Most EV conversions are manual transmissions because they are more efficient than automatic transmissions and provide greater range, require less motor torque, require no transmission cooler, and are easier to convert. Power Steering Power steering is not recommended because of the continuous power required of the battery system. Power Brakes Power brakes are a definite advantage as you increase the weight of the vehicle approximately 800-1200 lbs with the EV components. In many cases, this represents an increase of 20-25 percent in the curb weight of the vehicle. Your goal should always be to have a safe vehicle.
Power brakes unlike power steering are only an intermittent energy demand.
A typical system requires a 12 V vacuum pump, and a vacuum switch. As previously stated, converting an existing vehicle to an EV will add 800-1200 lbs in curb weight. Check the gross weight of the vehicle including the tires presently on the vehicle to see if it is designed for this increase. If the gross vehicle weight of the vehicle is exceeded, then the vehicle frame and braking system may be beyond their design value. You must also consider where the EV components will be located.