For visually impaired individuals, recognizing and avoiding obstacles in their surroundings can be challenging, making solo shopping faces potentially dangerous. To enable the visually impaired people to shop independently, we propose a shopping cart-type robot system that uses passive servo brakes instead of active motors to assist the visually impaired people in obstacle avoidance. We make a prototype of the proposed shopping cart and implement an obstacle detection function into the system. We conducted an obstacle avoidance experiment to evaluate the feasibility of the proposed system, the results show the blind-folded users could avoid obstacles on the way most of the time using the system.