If the hydraulic brake drive is in good working order, the decrease in the fluid level in the reservoir is associated with wear of the brake pad linings. A decrease in the fluid level to the MIN mark indirectly indicates their extreme wear. In this case, it is necessary to check the condition of the linings, and there is no need to add brake fluid to the reservoir, since when installing new pads, the fluid level in the reservoir will rise to normal.
The "Brake failure" indicator lights up when the brake fluid level in the reservoir drops below the MIN mark, which, in the case of partially worn or new brake pads, indicates a loss of system tightness and fluid leakage. Topping up the liquid (see appendix 1) in this case, carry out only after restoring the tightness of the system at a certified PSSS.
When checking the brake fluid level in the reservoir, do not forget to also check the correct operation of the brake fluid emergency level sensor, for which press on the top of the central part of the protective cap of the sensor 1 - with the ignition on, the "Brake failure" indicator in the instrument cluster should light up red.