Brake device and vehicle equipped with brake device

A vehicle comprising:

• a vehicle body;
• a plurality of wheels located beneath the vehicle body, rotatable, and including respective brake disks;
• and
• a plurality of brake devices disposed respectively at the plurality of wheels, wherein each brake device is operative to come into contact with each brake disk to limit rotation of each wheel,
• wherein at least one of the plurality of brake devices includes:
• a caliper body including an accommodating portion located on a side surface of the caliper body;
• a pair of brake pads respectively positioned on a pair of seating surfaces within the caliper body so as to face both surfaces of the brake disk;
• a master cylinder located in the accommodating portion and storing brake fluid therein;
• a reservoir located above the master cylinder and operable to supply the brake fluid to the master cylinder;
• a master piston located in the accommodating portion and extending into the master cylinder, the master piston being movable linearly in the master cylinder;
• a braking motor positioned on the side surface of the caliper body and operative to generate a rotational force in response to receiving an electrical signal;
• an electronic control unit (ECU) mounted below the accommodating portion opposite from the reservoir and configured to generate the electrical signal;
• a bolt screw operably coupled between the master piston and to the braking motor and configured to convert the rotational force into a linear motion to drive the master piston, the bolt screw being located within the accommodating portion;
• a plurality of caliper cylinders located on the pair of seating surfaces of the caliper body and connected to the master cylinder;
• a plurality of caliper pistons inserted respectively into the plurality of caliper cylinders;
• and
• a first connection portion extending from the master cylinder and connected to each of the caliper cylinders in parallel,
• wherein, when the braking motor is operated, the master piston is operative to pressurize the brake fluid in the master cylinder and transfer the brake fluid to the plurality of caliper cylinders through the first connection portion, and the plurality of caliper pistons is operative to protrude, by a pressure from the brake fluid, to press the pair of brake pads, and
• wherein the master cylinder is arranged such that, when the master piston is driven to pressurize the brake fluid in the master cylinder, the master piston is moved in a direction that is perpendicular to a direction of movement of the caliper pistons.