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Driving in heavy traffic and on a steep road is not quite convenient since frequent use of a hand-brake is required. In order to overcome this problem, Suharto and colleaques[1] had proposed a design of an automatic brake locking system (ABLS) to replace the use of the hand-brake. Though the system work well, a small but annoying problem was still encountered in the design. The problem occured during the release of the brake. Releasing the brake at high rpm setting causes the car to make a jerky start while setting this parameter at a lower value causes the car to move slightly backward. This work is motivated to reveal such phenomena and to find a good tuning parameter which, if possible, produce the best comfortable movement.