To replenish the amount of liquid in the tank, remove the lid and pour in the liquid.
If you have to top up the fluid frequently and the low level is indicated by a light on the instrument panel, the cause may be worn brake pads. Typically, the brake pads on the front wheels wear out.
Brake fluid replacement
Brake fluid should be changed every two years or at 60,000 km. Brake fluid is a mixture of ethylene glycol, polyether oxyethylene, and several other components. This colorless or yellowish liquid is poisonous and also aggressive towards paintwork. It does not affect metal or rubber parts and maintains sufficient fluidity even at -40°C. Its boiling point is also quite high – approximately 290°C.
(Source can be seen at: PeugeotBook.ru)
However, brake fluid is hygroscopic and absorbs moisture, which simultaneously lowers its boiling point. At a moisture content of 2.5%, its boiling point is only 150°C. This is quite dangerous, considering the brakes are subject to significant stress. In such cases, moisture evaporates, forming air locks in the hoses and lines of the brake system. In such cases, the brake pedal fails and the brakes do not work. In this case, the only way out is to repeatedly press the brake pedal (pumping).
15. Remove the brake fluid from the reservoir, leaving a layer of liquid approximately 1 cm thick.
16. Add fresh brake fluid (DOT 3 or 4).
17. Loosen the bleed screws on the brake mechanisms of the wheels one by one and bleed the system, each time fully pressing the brake pedal at least 10 times.
18. Monitor the brake fluid level in the reservoir and top up if necessary to prevent the reservoir from running empty and air from being pumped into the system.
Start bleeding from the brake mechanism nipple on the right rear wheel.