Ducati Diavel
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Ducati Diavel Service Manual: Operating principle

The ducati abs brake system manages the front and rear brakes separately. A pulse generator (phonic wheel), with a ring of slots, is fixed onto each wheel. On the left calliper mounting bracket of the front fork and on the rear brake calliper holder plate are hall effect sensors which detect the full sections and voids on the phonic wheel as the vehicle moves, providing and instantaneous wheel speed reading. These sensors transmit the data to the abs control unit, which contains software implementing a specific control algorithm developed by ducati. The software compares the average speed of the vehicle against the instantaneous wheel speed values to determine the degree of skidding. If the pressure applied to the calliper by the rider causes the control limits to be exceeded, the control unit intervenes in the braking circuit relative to the wheel for which incipient lock-up is detected. The abs modulates the calliper pressure with a system of solenoid valves that initially prevents any further increase in hydraulic pressure (ev valve closed), and then reduces pressure (av valve opened). 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 rotate again in response to the diminished braking force applied and the wheel speed reaches the reference value, the av release valve is 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 accordingly in the three following different conditions: dry road surface (high grip), wet or greasy road surface (poor grip) and uneven road surface. Abs functionality is disabled at vehicle speeds lower than 5 km/h.

A diagram illustrating how the abs system functions is given below.

Operating principle


The hydraulic component of the abs system consists of a primary circuit (from the cylinder to the control unit and from the control unit to the calliper) and a secondary circuit (completely within the control unit). The hydraulic layout of the abs system is given below.

Key for abs hydraulic system layout

Key for abs hydraulic system layout


Abs system information
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Abs system operating information
The response of the system is based on the analysis of the speed signals for front and rear wheels; the system is automatically deactivated if either of these signals is missing. Note In the even ...

Other materials:

Refitting the fuel tank
If the fuel tank has been disassembled into its component parts, reposition all the parts as shown in the exploded view. In particular: tighten the screws (13) to a torque of 5 nm +/-10% (sect. 3 - 3, Frame torque settings). Refit the tank by inserting its rear side into the pin on the ...

Low hands free key (hf) battery level
The activation of this (amber yellow) "warning" indicates that the hands free system has detected that the battery that permits the active key (a) to communicate and turn the vehicle on is almost discharged. Note In this case replace as soon as possible the battery as indicated in sect. 6 - ...

Removal of the clutch
Note For clarity, the figures show the engine removed from the frame. Undo the fixing screws (1) and remove the ring (2) and the springs (3) from the pressure plate (4). Slide the pressure plate (4) paying attention to the circlips (6). Remove the clutch control pin (14) and the ...

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