I’ve had a fight with our Smart for 2 weeks.First the scratching on the rear axle sporadically then it got worse. Both with the foot brake as well as with the hand brake.Then I opened the brakes and found a leaky brake cylinder, so brake completely new at the rear! No improvement. So the brake felt opened 10 times and looked for the error.Even the brake drums were first turned off then renewed and tested for sure 4 times.Then all engine bearings new! No improvement. Wheel bearings both renewed.Even then no change. Drive shafts I had already out, both ok. So slowly I get the talent. If another has an idea or solution.