My Smart 453 (brake problems, fuel consumption, wind noise…)

Hello together, with all my despair I turn to you and hope that you can help me further. Have my 453 since 01/2015 and now 25000km on it. As far as so good, at the beginning mostly driven in the city, except for the unacceptable fuel consumption no problems. Wind noises at the driver’s door in the workshop criticized -> during the test drive no were found… well, I’m probably stupid. Recently I have been in several danger situations (stauende behind Kur) The “ABS” lamp flashes, the car loses its grip, is almost no longer controllable. I was therefore already at the Mercedes dealer: After the test drive the master says it’s all great with my car, free according to the motto I couldn’t drive and it would all be on my all-weather tires (which were delivered by the SC. ) Before that I came home and discovered that the tire was running at one place except on the wire. This can’t be any more in times of ABS, can it? I find it really a danger to drive the thing now, because if you have to brake heavily you are lost.. The really hardly working hands-free device is really the smallest problem. Could you give me any tips on what I can do? Thanks and LG Moe2k