The brake fluid level in the reservoir with the cap installed should reach the lower edge of the filler neck.
When the tank cap is removed, the fluid level should reach the top edge of the tank mounting clamp. An increase in the fluid level in the clutch hydraulic reservoir indirectly indicates (with a sealed hydraulic drive) about significant wear of the clutch driven disk linings.
To add brake fluid to the reservoir, turn it counterclockwise...
and remove the tank lid.
Taken from the website [www.LadaMan.ru]
Add DOT-4 fluid to the tank to the required level.
We put the lid back in place, screwing it tightly.
Brake fluid that comes into contact with the vehicle's paintwork, plastic parts and wiring can cause damage. Remove it immediately with a clean cloth.