PURPOSE: To prevent re-locking in the case when the speed of a wheel largely decreases, and to re-pressurize braking pressure rapidly when the speed slightly decreases by relating a point of time of the starting of the re-pressurization of the braking pressure with the decrease of the speed of the wheel.

CONSTITUTION: Wheel speed signals VW are inputted to a low peak value holding circuit 10, and low peak value VWL is outputted. A dividing circuit 11 divides the speed of the wheel at a fixed rate and outputs divided signals K1VW, and a comparator 12 compares both signals, and outputs re-pressurizing signals S2 when K1VW becomes larger than VWL. A sample holding circuit 13 holds the speed of the wheel VWO at the time when commencing control, a dividing circuit 14 divides the speed at a fixed rate and changes it into K2VWO and a comparator 15 outputs signals when the speed of the wheel is less than K2VWO. The output of the comparator 15 turns the dividing value of the dividing circuit 11 into K'1 from K1, and re-pessurization is delayed when the speed of the wheel largely decreases, thus preventing re-locking.