Constant control
On the left rear of the engine compartment, directly on the main brake cylinder, there is an expansion tank with brake fluid.
In the transparent whitish expansion tank, the brake fluid level should be between the "MIN" and "MAX" marks.
If the fluid level has noticeably dropped - which in the Vectra is additionally indicated by a warning light on the dashboard - the brake system needs to be checked for leaky areas.
Brake fluid level too low
If the disc brake pads are already slightly worn, then a tendency for the fluid level to drop to the lower mark is visible; if they are new, then the fluid level is higher. This is a completely normal phenomenon, since when the linings are worn out, the disc brake pistons that have moved out a little further leave large volumes in the brake caliper cylinders, which are filled with brake fluid. On the contrary, the situation is critical if the brake fluid has dropped below the "MIN" level in one of the parts of the reservoir. Since it does not evaporate or is not consumed, it is removed only due to leakage. Therefore, find the cause as quickly as possible (see text below), until it is empty someday. Adding liquid would be a scam!
Tip: Although there is only one expansion tank, if the brake circuit is not sealed, all the brake fluid cannot flow out, because the tank is divided into two chambers by a jumper.
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