It is necessary to make sure that the sensor is working 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 malfunctions, replace it. The sensor is replaced as an assembly with the brake master cylinder reservoir.
It is advisable to check the performance of the brake fluid level sensor each time the vehicle is serviced in accordance with the maintenance plan. If, with a sufficient level of brake fluid, the lamp continues to burn constantly, then it is necessary to check the electrical circuit connecting the sensor to the instrument panel (see «Checking and repairing electrical circuits»).
You will need a multimeter to do the job.
Execution sequence
1. We prepare the car for work (see «Preparing the car for maintenance and repair»).
2. Make sure the parking brake is off (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, on the instrument panel the control lamp for turning on the parking brake and malfunctioning the brake system should light up.
4. If the control lamp does not light up, press the latch and disconnect the wiring harness block from the sensor. With a piece of wire we close the contacts of the block of the wiring harness. If the lamp lights up, then the sensor is faulty. If the lamp does not light up, the sensor power supply circuit is faulty (cliff).
5. If the brake fluid level is normal (see «Checking the brake fluid level»). We turn on the ignition, on the instrument panel the indicator lamp for turning on the parking brake and malfunctioning the brake system should light up for two seconds and go out.
6. In the case when the lamp continues to burn, press the latch and disconnect the wiring harness block from the sensor. If after that the lamp went out, 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. With a rubber bulb, we select the brake fluid from the reservoir. To prevent air from entering the brake system, if there is no fluid in the reservoir, do not press the brake pedal.
8. Using the TORX E7 key, unscrew the fastening screw, remove it and remove the tank.
9. Install a new tank and add brake fluid to it.