A brake control device comprising: - a fluid source that is a supply source of fluid; - a skid detector adapted for detecting a skid of a car; - an adjustment valve adapted for adjusting a pressure of the fluid supplied from the fluid source to a predetermined pressure and outputting pressure-adjusted fluid; characterized by comprising: - an output valve adapted for receiving the fluid output by the adjustment valve, the output valve being adapted for outputting the fluid output by the adjustment valve when a switching command is input and not outputting the fluid output by the adjustment valve when the switching command is not input; - a discharge valve adapted for depressurizing an output by the output valve based on a detection result of the skid detector; - a control valve adapted for adjusting a pressure of the fluid supplied from the fluid source based on a brake command and the detection result of the skid detector to output the pressure-adjusted fluid; and - a relay valve adapted for adjusting a pressure of the fluid supplied from the fluid source based on a higher pressure between a pressure of the fluid output by the output valve and a pressure of the fluid output by the control valve to output the pressure-adjusted fluid to a brake cylinder. - a fluid source that is a supply source of fluid; - a skid detector adapted for detecting a skid of a car; - an adjustment valve adapted for adjusting a pressure of the fluid supplied from the fluid source to a predetermined pressure and outputting pressure-adjusted fluid; characterized by comprising: - an output valve adapted for receiving the fluid output by the adjustment valve, the output valve being adapted for outputting the fluid output by the adjustment valve when a switching command is input and not outputting the fluid output by the adjustment valve when the switching command is not input; - a discharge valve adapted for depressurizing an output by the output valve based on a detection result of the skid detector; - a control valve adapted for adjusting a pressure of the fluid supplied from the fluid source based on a brake command and the detection result of the skid detector to output the pressure-adjusted fluid; and - a relay valve adapted for adjusting a pressure of the fluid supplied from the fluid source based on a higher pressure between a pressure of the fluid output by the output valve and a pressure of the fluid output by the control valve to output the pressure-adjusted fluid to a brake cylinder. - an output valve adapted for receiving the fluid output by the adjustment valve, the output valve being adapted for outputting the fluid output by the adjustment valve when a switching command is input and not outputting the fluid output by the adjustment valve when the switching command is not input; - a discharge valve adapted for depressurizing an output by the output valve based on a detection result of the skid detector; - a control valve adapted for adjusting a pressure of the fluid supplied from the fluid source based on a brake command and the detection result of the skid detector to output the pressure-adjusted fluid; and - a relay valve adapted for adjusting a pressure of the fluid supplied from the fluid source based on a higher pressure between a pressure of the fluid output by the output valve and a pressure of the fluid output by the control valve to output the pressure-adjusted fluid to a brake cylinder.