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Hydraulic unit

Hydraulic unit


The hydraulic unit consists of:


• A valve block with three 3/3 solenoid valves (1 valve for the RH front wheel, 1 valve for the LH front wheel, 1 valve for the two rear wheels).

(Each valve has three positions: pressure build-up (normal position), pressure holding and pressure relieved).

• Equalization valve

• A control module with main relay and pump relay.

• Return pump

When the ignition switch is turned to the Drive position and the wheels begin to rotate, the return pump is always tested by the control module which starts the pump for about 0.5 seconds.


The master cylinder is separate from the hydraulic unit and connected to it by means of two pipes from the primary and secondary circuits.