Answer
As the automobile brakes to a stop, the kinetic energy decreases; kinetic energy is finally said to be 0 when the automobile stops completely (is not moving forward).
(This is of course neglecting any motion caused by the automobile engine itself.)
Work Step by Step
At the point as the automobile is braking, the kinetic energy is decreasing because the automobile is decelerating (slowing down). Recall that kinetic energy describes motion. If there is no motion (as the case will be once the automobile stops completely), there is no kinetic energy observed.
