For vehicles with mechanical type automatic transmission, the bracket for the clutch stroke sensor cover, which is to prevent ice from covering the sensor, is of the wrong type whose strength is not sufficient. Therefore, the bracket may break from vibration during driving etc, in which case ice may cover the stroke sensor. If this occurs and the vehicle continues to be driven, in the worst case, the stroke sensor might break, in which case the clutch plates would not be in contact with each other and the vehicle would stall.