The EBD system actively controls the distribution of the front and rear braking forces to correspond with changes in the load condition and displacement of the load due to deceleration.

When rear wheel speed is less than the estimated vehicle speed, the VSA modulator-control unit closes the inlet valve to maintain brake fluid pressure. As wheel speed increases, the VSA modulator-control unit opens the inlet valve momentarily to increase the brake fluid pressure. When lower pressure is required, the modulator unit opens the outlet valve momentarily decreasing fluid pressure. The VSA modulator-control unit repeats this valve control operation to control the EBD function.