Vehicle brake control device

A vehicle brake control device comprising:

• a friction material;
• a friction-applied material to which friction is applied, the friction-applied material being attached to a wheel;
• a parking brake that mechanically generates a braking force using the friction material and the friction-applied material;
• a service brake that generates a braking force by hydraulic pressure using the friction material and the friction-applied material;
• and
• electronic control means for controlling operation of the parking brake and the service brake,
• wherein
• the parking brake has a parking brake mechanism that performs a lock operation in which a pressing member is mechanically moved based on an operation of a driver by a moving member that moves in a direction in which the friction material comes into contact with the friction-applied material, and the friction material is moved and pressed against the friction-applied material by the pressing member, a lock retention operation in which a pressed state is retained, and a release operation in which the pressing member is moved and the friction material is separated from the friction-applied material by moving the moving member in a direction in which the friction material is separated from the friction-applied material and,
• the service brake has brake fluid pressure generation means for generating a brake fluid pressure, a wheel cylinder, which is coupled to the brake fluid pressure generation means, which, caused by an increase in the brake fluid pressure, moves and presses the friction material in a direction to come into contact with the friction-applied material by using the pressing member that is shared with the parking brake, and which, caused by a decrease in the brake fluid pressure, moves the friction material in a direction to separate from the friction-applied material by using the pressing member, and brake fluid pressure adjustment means that is able to adjust the brake fluid pressure of the wheel cylinder,
• the wheel cylinder is structured to include a cylinder shaped body having a hollow portion in which the pressing member and the moving member are housed and also to include a seal member between the body and the pressing member, and
• within a time period from a start of the lock operation to an end of the release operation, the electronic control means automatically increases, by using the brake fluid pressure adjustment means, a wheel cylinder pressure that is the brake fluid pressure inside the wheel cylinder and performs deformation amount correction pressurization to correct an amount of deformation of the seal member by applying the increased fluid pressure to the seal member within the time period from the start of the lock operation to the end of the release operation, the electronic control means completes the release operation of the parking brake after releasing of automatic increase of the wheel cylinder pressure caused by the brake fluid pressure adjustment means is completed, the automatic increase being for the deformation amount correction pressurization.