If it flashes longer or lights up while driving, stop immediately and check the brake fluid level. It is possible that the tightness in one of the brake circuits has been lost, and as a result it has failed, which you additionally feel by the lengthened pedal stroke (adjusting the brake pedal and information on this topic in the chapter brakes).
Tips: A low brake fluid level can be caused by badly worn brake pads. Reason: as brake pistons wear out, they move more out of the cylinders and make room for brake fluid, the level of which, logically, in the reservoir goes down.
If the brake fluid level indicator light comes on, then you should measure the thickness of the pads, unless you find another defect. In this case, do not add brake fluid to the reservoir, but replace the pads. To do this, press the pistons in the brake calipers. Consequence: The brake fluid level will rise again to the nominal value. Mistakenly filled brake fluid will spill out of the reservoir.
Troubleshooting
1. Checking the control light.
2. If, with the engine running, the control lamp is on, although the liquid level in the expansion tank is above the mark «MIN», for the sake of experience, disconnect the connector on the expansion tank fluid level sensor.
3. If the light goes out, then the sensor in the expansion tank is faulty - replace the tank.
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