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Anti-lock braking system - ABS
Continuous system ABS prevents locking of brakes during heavy braking. With this car remains manageable. The ABS operates at speeds above 5 km / h and the ignition on. It fully controls the process of braking when the vehicle speed at least once exceeded 8 km / h. The system measures the speed of the wheels by means of two sensors on the front wheels and a single sensor - rear. According to the signals of the individual sensors electronic device calculates the approximate average speed of the car. By comparing the vehicle speed control device determines the degree of wheel slip and the individual states how close the brakes to lock. Once the wheel has shown a tendency to lock, the ABS system covers the pressure on the brake, keeping its present state. This means that the pressure in the brake mechanism does not increase even when the pressure on the brake pedal increases. If there is a further tendency to lock, the brake pressure is reduced in the ABS system by opening the discharge valve. This process proceeds up until the wheel again starts to accelerate. If the wheel again begins to accelerate, the ABS pressure increase its braking system, but it does not reach the pressure value in the common brake system. This process is repeated when braking for each wheel so long until the brake pedal is released, respectively, until the vehicle is stopped (the speed of 3 km / h). Security system in the electronic control unit ensures that the ABS switched off during a power failure or too low voltage (battery voltage less than 11 V); In this case the instrument panel lights up during a trip control emitter ABS. The brake system thus functions as usual. Vehicle braking behaves as if no ABS system. The hydraulic device is composed of the return pump, as well as of the three solenoid valves - one for the front wheels, and one - for the rear brakes. Pressurization: an inlet valve in the electromagnetic valve device is opened, the fluid pressure in the brake mechanism can be increased to a value that is provided by the brake master cylinder. Pressure constantly: closed inlet and outlet valves in the solenoid valve device. The fluid pressure in the brake mechanism does not change even if the pressure between the master cylinder and the solenoid valve increases. Decompression: open inlet valve to the electromagnetic valve. The brake fluid flows through an accumulator, from where it is pumped back in the master cylinder return pump. This is necessary not to lose fluid from the master cylinder. The operation of this pump there is a noticeable ripple on the brake pedal. The noise of the pump are attenuated by a damper brake circuit. When traveling ABS indicator lights up, this indicates that the ABS system is disabled. | PERFORMANCE ORDER | | 1. Stop the car, stop the engine and then slide it. | 2. Check the battery voltage. If the voltage is below 11 V, recharge it.
A warning  If the ABS warning light is lit from the start of the trip, and then goes out, the reason should be sought in the originally existing charging the battery voltage is too low.
| | 3. Raise the vehicle and remove the front wheels, inspect electrical wiring for external damage (rubbed). |
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ABS Further checks should be carried out in the workshop. The control unit tests the ABS system before each ride and stores appeared fault codes which remain in its memory even when the battery is disconnected. The branded shops these errors are decoded using a special device, and then purposefully eliminated.
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