A vehicle brake system includes a collision state determination section and a second brake controller. The collision state determination section determines a collision state of a vehicle. The second brake controller performs control of braking on the vehicle irrespective of braking operation by a driver in cases where it has been determined by the collision state determination section that the vehicle has collided. When it has been determined by the collision state determination section that the vehicle has been involved in a multiple collision, the second brake controller increases the braking control amount in such situations compared to a braking control amount during a single collision.