Vehicle brake system

A vehicle brake system (1) comprising:

• a hydraulic unit (20) that regulates a brake hydraulic pressure generated to a wheel cylinder;
• a braking control section (90) that controls the hydraulic unit (20);
• a master cylinder (14) that supplies a brake fluid to the hydraulic unit (20);
• an electric booster (10) that uses output torque of an electric motor (21) to boost brake operation input and transmits the boosted brake operation input to the master cylinder (14);
• a booster control section (100) that controls the electric booster (10) on the basis of a command from the braking control section (90);
• and
• a pre-crash brake execution determination section (110) that predicts a collision of a vehicle and determines execution of pre-crash brake operation, wherein
• the pre-crash brake execution determination section (110) sends information on a specified target value (P_tgt) for decelerating the vehicle to the booster control section (100) and the braking control section (90), and
• when a change amount (ΔP) of the target value (P_tgt), which is received from the pre-crash brake execution determination section (110), exceeds a specified threshold value (ΔP_thr), the booster control section (100) drives the electric booster (10) prior to the command from the braking control section (90) and executes preceding brake control for generating a specified brake hydraulic pressure to the wheel cylinder.