Hello, my friend has a very annoying and unusual problem with his BMW e91 318d 122ps. It is now on the highway the third time the valve in the rim at the rear left has been broken. The metal tube of the valve is released from the rubber. The first time it was a 16 inches rim with an old valve. The second time an 18 inches rim with a new valve (not 300km in it). The third time again the 16 inches rim with a new valve. And always back left! Always nac h 50-200km fast highway ride. But never over 210kmh, because the car does not drive faster. And what I have read are rubber valves up to 210kmh approved. Yes, you could actually build metal valves and have rest now, problem is just that I would very much like to find out the cause. One might think it would be something wrong with the vehicle, because always left behind and with different valves and rims/tires. But what could cause it? My friend taps on e in problem at the brake, because there was before he had the first breakdown everything changed from me. The caliper at the rear left was a bit tight, which then got a overtaking kit with new piston. Otherwise discs coverings and hand brake pads everything new from ATE. He thinks that the saddle may not be so free-run enough and at the highway the brake gets hot and by the heat the valve gets so warm that it gets broken. However, I can not imagine, since I already brake on and it is very free-accessible and since it is new disks you would immediately see a difference whether a hot runs, but both sides look exactly identical. But what else could it be? How can it be that within 1 week 3 valves say goodbye in the same way? With different valves and rims? This is a safety-relevant component, that can still become so hot and also at 300kmh something can not happen. As one could check to find out the cause? On the picture above one sees a new valve cut up by me, the lower one is the second defective one. It dissolves the vulcanization on the metal tube.