It is necessary to make sure that the sensor is working properly if it is found that when the brake fluid level drops to the MIN mark and below, the control lamp does not light up, and if it is faulty, replace it. The sensor is replaced together with the brake master cylinder reservoir.
It is advisable to check the functionality of the brake fluid level sensor at each vehicle service performed in accordance with the maintenance schedule. If the lamp remains constantly lit despite a sufficient brake fluid level, it is necessary to check the electrical circuit connecting the sensor to the instrument panel (see "Checking and repairing electrical circuits").
To complete the work you will need a multimeter.
Sequence of execution
1. Prepare the car for work (see "Preparing the car for maintenance and repair").
2. Make sure that the parking brake is released (see "Parking brake lever").
3. If the level in the tank is below the MIN mark (see "Checking the brake fluid level") turn on the ignition, the indicator light for the parking brake and brake system malfunction should light up on the instrument panel.
4. If the indicator lamp does not light, press the lock and disconnect the wiring harness connector from the sensor. Using a piece of wire, we close the contacts of the wiring harness connector. If the lamp lights up, the sensor is faulty. If the lamp does not light, the sensor power supply circuit is faulty (open circuit).
5. If the brake fluid level is normal (see "Checking the brake fluid level"). Turn on the ignition, the indicator lamp for the parking brake and brake system malfunction on the instrument panel should light up for two seconds and go out.
6. If the lamp continues to burn, press the lock and disconnect the wiring harness connector from the sensor. If the lamp goes out after this, then the sensor is faulty.
If the lamp continues to burn, then the instrument panel is probably faulty, the electrical circuit is faulty (short circuit) connections to the instrument panel.
7. Using a rubber bulb, remove the brake fluid from the reservoir. To prevent air from entering the brake system, do not press the brake pedal if there is no fluid in the reservoir.
8. Using the TORX E7 key, unscrew the fastening screw, remove it and remove the tank.
9. Install a new reservoir and add brake fluid to it.