Vehicle brake system

A vehicle brake system comprising:

• a force intensifier that is connected to a brake operator and is configured to increase a braking force that is generated;
• and
• a processor configured with a program to perform operations comprising:
• operation as an information acquisition part configured to obtain first information and second information, the first information being information on whether a shift position of an automatic transmission is in a non-driving mode in which power from a driving source is not transmitted to a drive wheel, and the second information being information on operation on the brake operator;
• and
• operation as a braking force controller configured to perform, in response to meeting a predetermined retention condition, control of braking force so that a stationary state of a host vehicle is maintained, wherein
• upon satisfying a set of criteria, the braking force controller is configured to perform control to increase the braking force that is generated with the use of the force intensifier once the brake operator is in a non-operated state, and wherein
• the set of criteria includes meeting the predetermined retention condition and the shift position being in the non-driving mode.