Brake control system

A brake control system, comprising:

• a master-cylinder including a primary piston that is activated by a brake pedal;
• a primary fluid chamber that produces hydraulic pressure by a movement of the primary piston;
• a secondary piston that is moved with the hydraulic pressure in the primary fluid chamber and a secondary fluid chamber that produces hydraulic pressure by a movement of the secondary piston;
• a first mechanism that regulates a pressure inside the master-cylinder according to an amount of operation of the brake pedal;
• a first control apparatus that controls an operation of the first mechanism;
• a second mechanism that regulates communication of the pressure inside the master-cylinder to a wheel-cylinder;
• and
• a second control apparatus that controls an operation of the second mechanism and an operation of a pump apparatus that increases a pressure that is communicated to the wheel-cylinder;
• wherein:
• the first and second control apparatus each comprises a built-in power supply circuit and a CPU;
• and
• the master cylinder is provided with
• a first hydraulic pressure sensor that measures a pressure inside the primary fluid chamber in the master-cylinder and is electrically connected to the first control apparatus;
• and
• a second hydraulic pressure sensor that measures a pressure inside the primary fluid chamber in the master-cylinder and is electrically connected to the second control apparatus;
• and
• wherein the first hydraulic pressure sensor is supplied with a power supply voltage from the first control apparatus;
• and
• the second hydraulic pressure sensor is supplied with a power supply voltage from the second control apparatus.