In some trim levels, an anti-lock brake system can be installed on the car, the purpose of which is to regulate the pressure in the brake circuits and to achieve the optimal level (about 15%) skid when braking the wheels When this condition is met, the best level of controllability and stability of the car when braking is achieved.
ABS contains three main groups of devices - an electronic control unit (ECU), impulse generators and hydraulic block. Pulse generators are installed on each wheel and transmit information about the rotational speed of each of the wheels to the computer. The hydraulic block, which is usually installed instead of the brake master cylinder, regulates the pressure supply to the wheel cylinder of each wheel with the help of the ECU. The electronic control unit, like complex engine management systems, is equipped with a self-diagnosis system.
The operation of the ABS is felt by the driver by vibration on the brake pedal during hard braking.
In the event of a failure in the system, the ECU turns off the ABS, while the control lamp on the instrument panel is constantly on, and the car can be braked using the vacuum brake booster.
The ABS warning lamp also comes on when the battery voltage is below 10 V. If the ABS warning lamp lights up while driving, stop and turn off the ignition and instruments, then start the engine. If the lamp goes out, then the voltage in the on-board network is higher than 10 V. If necessary, charge the battery.
If the lamp burning is not associated with a voltage drop, it is necessary to check the integrity of the wires and connections associated with the pulse generators of the wheel sensors.
More complex ABS checks should be carried out at service stations.
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