PURPOSE: To resolve the damage of the seal cup of a master cylinder, improve the reliability of a normal brake, attain good vehicle mounting property, and reduce the cast of a device in the brake liquid pressure control device for a vehicle performing the antiskid brake control and traction brake control.

CONSTITUTION: An antiskid liquid pressure control valve (f) and a traction liquid pressure control valve (g) are independently provided in series, the liquid pressure source switching function is applied to the traction liquid pressure control valve (g), the decompression at the time of the traction control is returned to a master cylinder (b), thereby a liquid pressure source selector valve and a reservoir cut valve are abolished.