Vehicle braking device

A vehicle braking device, comprising:

• a primary hydraulic pressure generating unit configured to generate a primary hydraulic pressure in accordance with a braking operation by a driver;
• a braking operation quantity detecting unit which detects a quantity of the braking operation;
• a control unit which determines a target hydraulic pressure based on the detected quantity of the braking operation;
• a secondary hydraulic pressure generating unit which generates a secondary hydraulic pressure by operation of an electric actuator, and wherein the control unit controls the actuator such that the secondary hydraulic pressure tracks the target hydraulic pressure based on the braking operation;
• and
• a braking operation force detecting unit which detects a correlation value of a force of the braking operation, the correlation value of the control operation force correlating to at least one of the primary hydraulic pressure and a load of depression of a brake operating member of the vehicle,
• wherein:
• the control unit controls the secondary hydraulic pressure generating unit to generate the secondary hydraulic pressure based on the detected quantity of the braking operation when the quantity is smaller than a predetermined threshold value, and controls the secondary hydraulic pressure generating unit to generate the secondary hydraulic pressure based on the correlation value of the control operation force or both of the correlation value of the control operation force and the quantity of the braking operation when the quantity of the braking operation reaches the predetermined threshold value and above, to thereby prevent the vehicle braking device from being overheated and enhance durability of components of the vehicle brake device;
• and
• the predetermined threshold value is based on the braking operation quantity at the time when the brake operating member of the vehicle approaches a maximum stroke position thereof.