Hello! Have a leak on my Audi 100 2.8 Quattro BJ1992. I have a controller on the left rear wheel, in front of the axle, and near the rear differential, rather right, still a controller, actually a load-dependent brake force regulator or similar. This is broken/undeclared. This is connected to the brake lines and a pressure storage. However, no stretch hose, or still is connected to it. Three “brakes” lines go to the rear: two from the ABS, and one goes somewhere towards the passenger compartment, pedals. Can anyone get a picture of it or explain what or how the whole thing works. Especially as the part is called, or what the two controllers does what?!