BRAKE SYSTEM

An automatic brake subsystem () includes second accumulators (F, R), a front second line () and a rear second line (), second brake valves (F, R), a first solenoid switching valve (), first shuttle valves (F, R), and a controller A second solenoid switching valve (F) and a pressure sensor (F) are provided in the front second line (), and a second solenoid switching valve (R) and a pressure sensor (R) are provided in the rear second line (). In a case where it is determined that each of the second brake valve (F, R) is not performing normally based upon a pressure of a hydraulic fluid detected by each of the pressure sensors (F, R) and an operating signal supplied to the first solenoid switching valve () or each of the second brake valves (F, R), a controller performs control to switch each of the second solenoid switching valves (F, R).