Abstract: When it is determined that a negative pressure is insufficient, an EGR-close control is executed so that an EGR valve is driven toward a close position to increase the negative pressure in an intake passage. After that, it is determined whether the negative pressure detected by a pressure sensor is restored to a specified target negative pressure. When the negative pressure is not restored to the target negative pressure even when a specified time period has elapsed after it is determined that the negative pressure is insufficient, an automatic brake unit executes a braking-force assist control to assist a braking force of a brake. A shortage of the braking force due to an insufficient negative pressure is compensated by the braking force generated by the automatic brake unit.