Operation

Sensors, front wheel (1) and sensor, rear wheel differential casing (2) detect wheel rotation and send information on the speed of rotation to the control module (3A). When braking, the brake light contact (4) signals to the control module which switches to 'standby mode'. The control module (3A) controls the braking force using the hydraulic system (5A) in response to signals from the sensors. It also monitors and posts any faults in the system. The position of the control module in the car depends on the engine type. In cars with four-cylinder engines, the control module is below the dashboard by the pedals. In cars with six-cylinder engines, the control module is always located on the right-hand side, behind the outer panel. Hydraulic system (5A) with pump and valves for controlling the brake pressure in the brake circuits. In cars with 6-cylinder engines and 4-cylinder non-turbo engines, the hydraulic system is located on the right-hand side of the engine compartment (5B). With 4-cylinder turbo and diesel engines, the hydraulic modulator is on the left-hand side (5A). Warning light (6). Comes on if there is a fault in the ABS system. DLC (7), for reading off and erasing DTCs. Valve relay (8), supplies hydraulic modulator valves with power. Pump motor relay (10) switches the pump on in response to a signal from the control module. Transient surge protection relay (9) filters out voltage spikes in the power supply to the system (stabilizes power supply).