Automotive anti-lock control system

An anti-lock control member controls the brake fluid pressure of a wheel brake (3a,3b) to a pressure decreasing mode where a normally-opened electromagnetic valve (8) is closed while a normally-closed electromagnetic valve (11) is opened, a holding mode where the normally-opened electromagnetic valve (8) is closed and the normally-closed electromagnetic valve (11) is closed, and a pressure increasing mode where the normally-opened electromagnetic valve (8) is opened while the normally-closed electromagnetic valve (11) is closed. Then, in a duty pressure increasing mode which is one of the pressure increasing mode, values of predetermined values D1, D2 which put a current value to be applied to the normally-opened electromagnetic valve (8) in a relationship such as 100>D1>D2>0 if in the pressure decreasing mode, a current value resulting when the normally-opened electromagnetic valve (8) is continuously turned on is 100, while a current value resulting when the normally-opened electromagnetic valve (8) is turned off is 0 are repeated at predetermined time intervals.