PURPOSE: To previously prevent early brake lock in driven wheels due to braking when a rear two-axle vehicle travels in an empty condition.
CONSTITUTION: When a rear two-axle vehicle 50 travels in an empty condition, an air bag means 11 works so as to lift a load toward a driven rear rear axle 54 by means of a fed pressure, and then, the load equivalent is shifted to a driving rear front axle 53, and driving force is secured in the driving rear front axle 53, while a road sensing valve is operated by means of an actuator which generates force by means of an air pressure of the air bag means 11, and as a result, a braking fluid pressure for driven wheels 56, 56 is reduced in a service brake system. Consequently, early brake lock in the driven wheels 56, 56 due to braking is prevented.
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