PURPOSE: To produce an excellent operation feeling at the initial stage of operation of a brake by realizing a jump-in function.

CONSTITUTION: A spool pressure intensifying operation force control means (i) or a spool pressure reducing operation control means (j) is provided for controlling a force in a direction, in which a control pressure exerted on the spool (d) of an oil pressure control valve (g) is increased, so as to provide characteristics, wherein a master cylinder pressure is changed in a low pressure region from high gain characteristics to low gain characteristics, as the characteristics of a control pressure to a master cylinder pressure.