To allow a brake including a ABS to maximize its performance without operating errors by avoiding abnormal situations such as fading phenomenon working on a brake device, and producing appropriate braking that match the personality of each driver.
This device includes an α-computing means 46 whereby the rule property of stamping force information from a stamping force detecting sensor 10 embedded in place in a hole provided in the arm part of a brake pedal and frictional force information form a frictional force detecting sensor 7 arranged in the mounting part of a brake device is computed according to the stamping force information and the frictional information, a P-computing means 47 for determining the target value of a source of auxiliary operating fluid pressure for replenishment when a braking limit is reached, and a solenoid valve control means 48 for generating appropriate braking forces by controlling each kind of valve system according to its necessity.