PURPOSE: To prevent the slip of tire under abrupt braking, by performing the pumping brake such that a magnet to be excited upon stepping of a brake pedal by predetermined amount will reset the brake pedal to the original position.

CONSTITUTION: A battery 5, main switch 1, pilot lamp 2, exchange switch 3 and a plunger type magnet 4 are interconnected through a wire 6. The exchange switch 3 is turned on when a brake pedal 7 is stepped to the point B by predetermined amount. Upon turning on of the switch 3, the magnet 4 is excited to reset the brake pedal 7 to the original position through a coupling metal 8. At the same time the switch 3 is turned off and the magnet 4 is denergized.