Hello, today suddenly had the following problem in the city traffic. In the traffic jam with depressed brake, suddenly the brake pedal continued to give way until it lay on the vehicle floor — small shock –. after further felt 10 seconds the car began to move slowly — shock with immediate sweat–. Immediately the automatic lever on P to prevent worse. after the traffic light immediately on a parking lot and visual control as far as possible, whether something can be recognized by the brakes (feigning kei Also under the vehicle and on the container to the extent visible, no loss of brake fluid to detect. I then tested if the vehicle can still be braked. YES- however only until the brake pedal is on the sheet again. at moderate speed approx. 2km on side road to a possible storage place and possible rental vehicle. After 200m drive no front assistant, no ACC possible, after 1km about AZEIG BREMSFLÜSSigkeit ! After the parking of the vehicle Bre However, no results were found for the visual inspection under the vehicle and on all brakes. Brakes before approx. 3000km (disk/block/liquid). KM Stand around 350000 vehicle is now near my workplace and I am home with a family car 70km. My guess is now a leaky main brake cylinder and that the brake fluid runs into the brake power amplifier. Is this problem known? if yes, both should be determined. (Even if Lüdinghausen has praised the good maintained condition this year) next Monday the vehicle will be brought into the workshop of my trust and went there for troubleshooting. Further report follows. A great help would be the original part number of the brake power amplifier for my Diva PS:239, engine capacity:2967, pollutant cl.:EURO-5, first registration:09/2008 engine code CEXA with ACC (Tempomat). As I womögli I would like to thank you very much to this forum that has helped me through the read posts so far. Harald