Electrohydraulic/electronic control unit (page 2 of 2)

The control unit, located in the engine compartment near the servo brake, is connected by the connections (1) to the brake pump and by connections (2) to the hoses of the braking system as shown in the previous diagram. With the exception of relays (6) and (7), the assembly cannot be overhauled and must be replaced if a defect arises. To replace the relays and the multipoint socket (8) it is necessary to remove the cover (9) after having unscrewed the retaining screws. From the sensors coupled with the phonic wheels, the control unit receives

information relative to the rotational speed of the wheels and processes it generating control signals which make it possible to vary the pressure of the brake fluid in the cylinders of the calipers.

Depending on the behavior of the wheels, the electrohydraulic assembly varies the pressure of the brake fluid on the brake calipers following three distinct operational phases, described in detail in the paragraph "OPERATING PRINCIPLES OF THE ABS SYSTEM".