Location of ABS system units
1, 2. Rear speed sensor; 3, 5. Speed sensor rotor; 4, 6. Front speed sensor; 7. Relay; 8. Actuator; 9. Control unit; 10. DLC1 connector; 11. Deceleration sensor; 12. Pilot lamp
The vehicles are equipped with an automatic brake release system (ABS system), designed to improve vehicle stability under heavy braking conditions. The pressure in the brake circuit is regulated depending on the speed of rotation of the wheels, registered by the sensors.
The vehicles are equipped with an automatic brake release system (ABS system), designed to improve vehicle stability under heavy braking conditions. The pressure in the brake circuit is regulated depending on the speed of rotation of the wheels, registered by the sensors.
Control block
Mounted on the right mudguard. The block receives signals from the brake light switch and speed sensors of each wheel, on the basis of which the pressure in the hydraulic drive of this wheel is regulated. If the wheel rotation speed differs from the base one, then the control unit opens the actuator solenoid valve and the fluid under excess pressure flows into the reservoir. The wheel is partially released. After equalizing the speed of rotation, the valve closes and the pressure builds up again. Numerous repetition of such cycles stabilizes the speed of rotation of all wheels and increases the stability of the car. The control unit also has a self-diagnosis function.
Actuator
It consists of a system of solenoid valves triggered by signals from the control unit.
Rear wheel speed sensors
Induction type sensors are mounted on each of the wheels. Sinusoidal signals from the sensor are sent to the control unit.
Stop signal switch
Ensures that the rear lights are switched on and alerts the control unit when braking.
Diagnostics and repair
After starting the engine, the ABS warning lamp lights up for 3 seconds, then goes out. Check the hand brake, hydraulic brake actuator, sensor and actuator connectors, system wiring. If the hand brake is released, the hydraulic actuator is in good condition, all contacts and connectors of the system are in good condition, then the ABS system is faulty and the car should be taken to a car service.