The Ducati ABS brake system manages the front and rear brake systems separately.
The operating mechanism consists of a pulse generator (phonic wheel), with a ring of slots, fitted onto each wheel.
There are HALL sensors on LH fork leg bottom end and on rear brake calliper holder plate. With vehicle running, they read
the slots on the phonic wheel thereby detecting instant wheel speed.
These sensors output data to ABS ECU, which contains a software with a special control algorithm developed by Ducati.
The software compares the vehicle average speed with the instant wheel speed reading and assesses any slipping condition.
If control values are exceeded when the rider commands a certain pressure on brake calliper, the control unit shall hydraulically
control the braking system, which is nearly locked up.
The system can modulate pressure at the calliper through a set of solenoid valves which first prevent any further increase
of hydraulic pressure (EV valve closing), and then make the pressure decrease (AV valve opening).
The AV valve is opened in a series of pulses (with less than 10 milliseconds between successive pulses), to reduce pressure
in steps.
When the wheel begins to turn again in response to the diminished braking force applied and its speed reaches the reference
value, the AV release valve will be closed.
Simultaneously, the EV inlet valve is reopened, restoring normal operation of the brake system. The ABS control unit can monitor
and modulate brake force in the three following different conditions: dry road surface (high grip), wet or slippery road surface
(poor grip) and uneven road surface. ABS functionality is disabled at vehicle speeds lower than 5 km/h.
Please find below a chart explaining ABS operation.