The Axle Modulator controls the brake actuation pressure on both sides of a single or dual axle. In an electro-pneumatic braking system, the Axle Modulator is installed between reservoir and brake cylinders in decentralized design.

The axle modulator records the signal using from wheel speed sensors, evaluates it and sends it them via the CAN bus to the central module, which subsequently calculates the nominal pressure. ABS control is applied directly by the rear axle modulators.

In the event of wheels locking or spinning, the rear axle modulator modifies the nominal pressure. The front axle modulator, actuated by the ABS solenoid valves installed to control the pressure on the front axle brake actuators, supports the ABS function on the front axle.