Provided is a braking control system including: an internal combustion engine serving as a power source of a vehicle a brake servo unit operated by a negative pressure supplied thereto a passage configured to supp1y an intake negative pressure of the internal combustion engine to the brake servo unit and a negative pressure pump configured to generate a negative pressure by being driven by power transmitted from a wheel. of the vehic1e and transmit the generated negative pressure to the brake servo unit, wherein the negative pressure pump is driven so as to supply the negative pressure to the brake servo unit (570) during execution of inertia running (YES i n S10) in which the internal combustion engine stops and the vehicle runs by inertin.
