Bicycle device and brake system

A brake device for applying a braking force to a rotary body of a human-powered vehicle, the brake device comprising:

• a power transfer medium operated braking portion, the braking portion including a caliper configured to clamp the rotary body;
• a first actuator operatively coupled to the power transfer medium operated braking portion by a power transfer medium, the first actuator including a pump using a fluid as the power transfer medium;
• and
• a second actuator operatively coupled to the first actuator and operated by electric power in accordance with an input to an operating device, the second actuator including an electric motor,
• the pump including a master piston configured to be driven by the electric motor,
• the caliper including a caliper body, a plurality of slave pistons provided at the caliper body, and a flow passage provided at the caliper body to apply hydraulic pressure to the plurality of slave pistons in accordance with movement of the master piston,
• an axis of a motor output shaft of the electric motor and a longitudinal axis of the master piston are offset and substantially parallel, and
• each of movement directions of each of the plurality of slave pistons is configured to be different from each of movement directions of the master piston.