Braman Audi dealerships are joining the glut of litigation against Volkswagen over its emissions scandal.

Two dealerships owned by South Florida billionaire Norman Braman sued the German automaker in West Palm Beach federal court on Sept. 5. The dealers allege they had trouble selling vehicles because of the widespread knowledge of Audi parent company Volkswagen’s scheme to use software to allow cars to pass emissions tests when they were polluting above legal levels.