Warning: Before starting any repair work on your vehicle, be sure to read the safety instructions for working with brake fluid.
The brake fluid level is checked periodically during vehicle operation or during each maintenance, after bleeding the brakes (brake system) and replacing the brake fluid when the control lamp on the instrument panel lights up, indicating an insufficient level of brake fluid in the master cylinder reservoir.
Sequence of work to check the brake fluid level:
1. Preparing the vehicle for work (see point 2a "Preparing a car for maintenance and repair").
2. Using a rag, wipe off any dirt from the brake master cylinder reservoir.
Information taken from the website VAZBOOK.RU
3. Visually check the brake fluid level in the master cylinder reservoir. It should be between the "Min" and "Max" marks on the brake reservoir body.
4. Check the degree of wear of the brake pads of the front and rear brake mechanisms (see "Front brake pads - checking for wear") and (see "Rear brake pads - checking for wear").
5. If the brake pads wear is within the normal range, and the brake fluid level in the master cylinder reservoir is below the "MIN" mark, then disconnect the wiring harness tip from the emergency brake fluid level drop sensor, unscrew and remove the brake reservoir cover (see paragraphs 1 and 2 "Low Brake Fluid Sensor - Checking and Replacing").
Warning: Do not reuse brake fluid that has been drained from the vehicle's brake system.
6. Add new brake fluid to the master cylinder reservoir (when installing the reservoir cap, the sensor float will be immersed in the brake fluid and its level will increase, so do not add brake fluid to the reservoir up to the "Max" mark.
Warning: If brake fluid in the master cylinder reservoir has to be added frequently, it is necessary to check the tightness of the brake system (visually checked for signs of brake fluid leakage from the brake cylinders and joints of system elements).
7. Close the brake reservoir cap tightly.
8. Connect the wiring harness connector to the sensor connector.
9. Check the operation of the brake fluid emergency level sensor: with the ignition on, press the rubber pad of the brake reservoir cover from above. If the sensor is working properly, the control lamp on the instrument panel will light up.