Anti-lock braking system (ABS) (VW Golf 2)

In some trim levels, the vehicle may be equipped with an anti-lock braking system, the purpose of which is to regulate the pressure in the brake circuits and to achieve an optimal level (approximately 15%) of slip when braking the wheels. When this condition is met, the best level of controllability and stability of the vehicle is achieved when braking.

The ABS contains three main groups of devices - an electronic control unit (ECU), pulse generators and a hydraulic unit. Pulse generators are installed on each wheel and transmit information about the rotation speed of each wheel to the ECU. The hydraulic unit, which is usually installed instead of the main brake cylinder, regulates the pressure supply to the wheel cylinder of each wheel with the help of the ECU. The ECU, like complex engine management systems, is equipped with a self-diagnostic system.

The activation of the ABS is felt by the driver through vibration in the brake pedal during sudden braking.

If the system fails, the ECU switches off the ABS, while the control lamp on the instrument panel is constantly lit, and the car can be braked using the vacuum brake booster.

The ABS failure indicator lamp also lights up when the battery voltage is below 10 V. If the ABS indicator lamp lights up while driving, stop and turn off the ignition and instruments, then start the engine. If the lamp goes out, the voltage in the on-board network is above 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 performed at service stations.