| 摘要 |
PROBLEM TO BE SOLVED: To reduce a load on a booster pump or on a switching valve so as to prevent noise by closing the first switching valve while opening the second switching valve when a brake is applied suddenly and feeding brake fluid in a reservoir tank to a brake wheel via a main brake fluid passage from an auxiliary brake fluid passage by means of the booster pump. SOLUTION: A vehicle sudden braking determination device 37 performs determination on the basis of a wheel speed signal from a wheel speed sensor 33 and outputs a braking auxiliary control signalνto a control unit 19 in the case of sudden braking on a highμroad. In this way, a braking slip solenoid switching valve 15 is closed, and communication between a master cylinder 12 and a wheel cylinder 14 is cut off. The control unit 19 opens an auxiliary controlling solenoid switching valve 31 and forcibly feeds brake fluid in a reservoir tank 21 quickly from an auxiliary brake fluid passage 20 to the wheel cylinder 14 via a main brake fluid passage 13 by means of a booster pump 25. As a result, pressure increasing auxiliary control for the brake fluid is prohibited, and a load on the booster pump or on the solenoid switching valve can be reduced.
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