Location of ABS system units
1. Rear speed sensors; 2, 5. Speed sensor rotors; 3. Brake light switch; 4. Control unit; 6. Front speed sensors; 7. Actuator; 8. Relay; 9. Slowdown sensor
Actuator
The actuator consists of a master cylinder, an electro-hydraulic pump and 4 solenoid valves.
The pump is designed to pump fluid into the actuator receivers, through which pressure is supplied to the brake circuit.
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The valves control the pressure in the brake circuit when the ABS system is activated; there is 1 valve per wheel.
Wheel speed sensors
Rotary type sensors are mounted on each wheel. Signals from the sensors are sent to the control unit.
The front sensors are mounted on the steering knuckle, next to the toothed rings of the rotors. The rotors are structurally integrated with the front axle shafts.
The rear sensors are mounted on the axle beam, the rotors are part of the rear hub.
ABS control unit
The control unit is mounted under the front bulkhead of the body. The unit receives signals from the brake light switch and the speed sensors of each wheel, on the basis of which the pressure in the hydraulic drive of this wheel is regulated. The control unit also has a self-diagnostic and failure memorization function.
If the system fails, a warning light on the instrument panel lights up and a failure code is stored in the memory, which can be read to determine the nature of the malfunction.