A braking system comprising: a master cylinder (25, 82) configured to generate a brake fluid pressure in conjunction with a braking operation of a brake operating unit (21, 22), a wheel braking means (42, 84) configured to provide a braking force to a wheel by the fluid pressure, a first brake fluid channel configured to connect the master cylinder (25, 82) and the wheel braking means (42, 84) respectively, a first electromagnetic opening and closing valve provided in the first brake fluid channel for bringing the master cylinder (25, 82) into communication with the wheel braking means(42, 84), or for bringing the master cylinder (25, 82) out of communication with the wheel braking means (42, 84), a power unit configured to generate the fluid pressure by an electric actuator, a second brake fluid channel configured to connect the power unit and the wheel braking means (42, 84) respectively, a second electromagnetic opening and closing valve provided in the second brake fluid channel for bringing the power unit into communication with the wheel braking means (42, 84), or for bringing the power unit out of communication with the wheel braking means (42, 84), and an ECU configured to open and close the first electromagnetic opening and closing valve and the second electromagnetic opening and closing valve, characterized in that the ECU includes: a bleeding mode setting unit configured to open and close each of the first electromagnetic opening and closing valve and the second electromagnetic opening and closing valve in order to perform a bleeding operation from a brake fluid path including the first brake fluid channel and the second brake fluid channel, and a determining unit configured to determine whether or not to permit the transfer to a bleeding mode, wherein the bleeding mode set by the bleeding mode setting unit includes a control mode which brings the second electromagnetic opening and closing valve into a closed state and in which the power unit generates fluid pressure. a master cylinder (25, 82) configured to generate a brake fluid pressure in conjunction with a braking operation of a brake operating unit (21, 22), a wheel braking means (42, 84) configured to provide a braking force to a wheel by the fluid pressure, a first brake fluid channel configured to connect the master cylinder (25, 82) and the wheel braking means (42, 84) respectively, a first electromagnetic opening and closing valve provided in the first brake fluid channel for bringing the master cylinder (25, 82) into communication with the wheel braking means(42, 84), or for bringing the master cylinder (25, 82) out of communication with the wheel braking means (42, 84), a power unit configured to generate the fluid pressure by an electric actuator, a second brake fluid channel configured to connect the power unit and the wheel braking means (42, 84) respectively, a second electromagnetic opening and closing valve provided in the second brake fluid channel for bringing the power unit into communication with the wheel braking means (42, 84), or for bringing the power unit out of communication with the wheel braking means (42, 84), and an ECU configured to open and close the first electromagnetic opening and closing valve and the second electromagnetic opening and closing valve, characterized in that the ECU includes: a bleeding mode setting unit configured to open and close each of the first electromagnetic opening and closing valve and the second electromagnetic opening and closing valve in order to perform a bleeding operation from a brake fluid path including the first brake fluid channel and the second brake fluid channel, and a determining unit configured to determine whether or not to permit the transfer to a bleeding mode, wherein the bleeding mode set by the bleeding mode setting unit includes a control mode which brings the second electromagnetic opening and closing valve into a closed state and in which the power unit generates fluid pressure. a bleeding mode setting unit configured to open and close each of the first electromagnetic opening and closing valve and the second electromagnetic opening and closing valve in order to perform a bleeding operation from a brake fluid path including the first brake fluid channel and the second brake fluid channel, and a determining unit configured to determine whether or not to permit the transfer to a bleeding mode, wherein the bleeding mode set by the bleeding mode setting unit includes a control mode which brings the second electromagnetic opening and closing valve into a closed state and in which the power unit generates fluid pressure.