Have a Mercedes T1 tow truck “407 D” , Bj 1985, and after long restoration had to find out that there is no brake fluid at the rear brakes. Now I have already opened a few pipes to see when there is liquid, but in the area something in front of the rear axle, to the right, the brake line flows which comes from the front, and those which goes further to the rear to the brakes, into a strange component that I do not know. I have the assumption that through this part the liquid cannot get back, at least no liquid comes out at the rear opening when I kick the pedal. Can someone tell me what that part is? Thank you very much! Greetings, Michael