* Faulty brake fluid sensor: The brake fluid sensor is responsible for monitoring the level of brake fluid in the reservoir and sending a signal to the instrument cluster when the level is low. If the sensor is faulty, it may be sending a false signal to the instrument cluster, even if the brake fluid level is OK.
* Low brake fluid pressure: The brake warning light can also come on if the brake fluid pressure is low. This can be caused by a leak in the brake system or a problem with the master cylinder.
* Worn brake pads: In some cases, worn brake pads can also cause the brake warning light to come on. This is because the brake pads are responsible for generating friction to slow the car down, and if they are worn out, they may not be able to generate enough friction to properly stop the car. This can cause the brake fluid pressure to drop, which in turn can trigger the brake warning light.
If the brake warning light is on in your car, it's important to have the vehicle inspected by a qualified mechanic as soon as possible to determine the cause of the problem and have it repaired. Driving with a faulty brake system can be dangerous and should be avoided.