Anti-lock Braking System(ABS) 5 D. SCHEMATIC OF HYDRAULIC CIRCUIT : General: The Anti lock braking system consists of a Hydraulic modulator with integrated Electronic control unit, four wheel speed sensors (one located at each wheel) and 2 warning lamps in the instrument cluster (1(yellow) for ABS and 1(Red) for EBD). The brake pipes are connected to the brakes through the ABS ECU / HCU. They make two independent circuits which are vertically split. The primary circuit connects the Front Left and the Front Right brake while the secondary connects Rear Right and Rear Left brake through connectors. Internal to the Hydraulic modulator each brake has a pair of solenoid valves, one inlet and one outlet; these are activated by the ECU to control the brake pressure of individual wheels.
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