MOT test of R75 Front suspension lower wishbone rear bushes
Hi Folks, I have a 2004 R75 Mk11 with 83K miles and I took it for MOT test last week. It failed on front lower arm rear bushes deteriorated allowing excessive play. I checked them out myself and they looked like new. I tried a length of wood between the arm and the body in front of the bush and there was very little movement with hand force. I also tried a 1m bar into the wheel to move the suspension (with the car raised on a jack under the centre engine lift point) with the wheels just about to lift off and the only movement discernible was the alloy wheel starting to flex. Same both sides. The bushes are (or were before the brutality of the MOT test) fully attached between inside and outside and very little visible cracking. I spoke to the garage and the workshop supervisor said he would get another technician to check it and show me the problem. They showed me the vehicle on a ramp on a test pit but what they did horrified me. They turned on an automatic wheel play detector that seemed to try and pull the wheels apart and ram them together again rapidly. The suspension was going in and out like a fiddlers elbow between maximum and minimum travel and the ends of the lower arm were being wanged about. I thought they were going to rip the bearings off the car. My understanding is that the MOT test should use gentle force but this machine seemed to be set to destruction testing. Does anyone know how such machines should be used and is such a test expected in an MOT? Having seen the bushes again there appears to be the start of some tearing and I am not surprised if this is what they are subjecting them to. The bushes seem to be designed to have some movement but I would have thought that if they are rapidly twisted, pushed and pulled between their extremes, they won't last long. Is there anyone here who does MOT tests and is familiar with these machines, that can comment please? Are they normally that violent and can the speed and range of movement be adjusted? They agreed to just issue an observation rather than a fail but I am worried that having gone through this aggressive test they will now be compromised.