a brake control apparatus is provided with a simulator for applying a biasing force to a manually operated braking member of a vehicle in response to braking operation . a sensor detects conditions of the vehicle including a braking condition of the vehicle . a first biasing device applies a first biasing force to the manually operated braking member in response to braking operation , and a second biasing device applies a second biasing force , as well . only one of the first and second biasing devices applies the biasing force to the manually operated braking member when a predetermined condition is detected by the sensor , while both of the first and second biasing devices apply the biasing forces in the normal braking operation . the second biasing device may include a cylinder having a bore defined therein , and a piston slidably received in the bore to define a chamber filled with brake fluid , an elastic member for biasing the piston to expand the chamber , and a reservoir communicated with the chamber of the cylinder for storing the brake fluid drained from the cylinder , and controlled by a controller in response to outputs of the sensor .