The Audi A4 dispenses with the traditional brake force regulator for the rear wheels. Instead of mechanical or hydraulic pressure control, the ABS hydraulic module is used for electronic brake force distribution (Elektronische Bremskraft-Verteilung). This is done by the ABS control unit.
The control unit monitors the deceleration of each rear wheel by means of a speed sensor and compares the values of the front and rear axles. If the difference between the speed of the front and rear wheels is too great when braking, the pressure on the rear wheel brakes is reduced by the solenoid valves in the hydraulic module. In this way, excessive braking of the rear axle is not allowed, the Audi remains in a rut.
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