The reservoir has two chambers, one for each of the brake system circuits.
The screw plug for the common filler hole has a ventilation bore that should not be plugged.

(B25-042) The reservoir is transparent, so the liquid level in it can be easily checked. This level should be between the minimum and maximum marks.
When the front disc brakes wear out, a slight decrease in the brake fluid level is observed, this is normal.
If the liquid level drops sharply in a short period of time, this indicates liquid loss.
The leak location must be found immediately. Typically, the cause is a worn-out cuff in the wheel brake cylinder. For safety reasons, it is better to entrust such a check to a workshop.

The original can be seen on the portal vwmanual.ru
(02-285) Before filling the brake fluid, place a rag on the reservoir and make sure that it does not drip onto the reinforcement panel. Failure to do so may cause damage.

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