L322 2005 td6

another problem guys,my brake fluid is going down a lot,the only place i can see wet mark on the ground,is underneath in front of the left rear wheel,there is a plastic hatch in the cover,and the fluid is comming out of there. has anyone an idea whats in there?is there anything connected to the brakes in there?

Yes a line runs in the inner plastic arch before the flexi

ok thanks must be it,another few hours underneath,some of the many lol