Brake device for vehicle

A brake device for a vehicle comprising a fluid supply portion that supplies a fluid to a wheel cylinder utilizing the fluid in a reservoir, the brake device being configured such that a piston presses brake pads against a disc rotor in accordance with a hydraulic pressure in the wheel cylinder, so as to apply a braking force to a wheel, the brake device comprising:

• a fluid level sensor configured to measure a value of a fluid level in the reservoir;
• and
• a controller including one or more processors and configured to:
• estimate a wear amount of the brake pads based on a result of measurement by the fluid level sensor;
• estimate a heat generation amount of the brake pads based on the result of measurement by the fluid level sensor;
• and
• determine whether a leakage of the fluid is occurring based on i) an amount of change in the fluid level that is based on the result of measurement by the fluid level sensor, ii) the wear amount, and iii) the heat generation amount.