The end castor positions are deliberate.... Castor has many duties the main one is directional stability. If the castor positions are staggered toward the right then the inert energy can belay the effect of the road crowns bias to the left.
The MB tolerances are very small so in order to belay the historic drift left we have to violate the "suggested" MB datum and it's for this reason MB cannot stop the pull left because they cannot move outside of the datum.
The "cross castor" which is now in red is a warning the car will/ could pull right. Again the tolerance disparity between the front castors is very small so again we need to violate the tolerance.
If we used the powerful energy generated by the camber then it would be easier but open to the fact tyre wear could become an issue. You will not get tyre wear from a castor stagger unless it was a few degrees outside of the suggested datum.
It could be argued the car will pull right on a flat road or in the EU, well i don't deny that but it's hobsons choice. The customers complaint is pulling left, telling me what type of environment the car is mostly driven.
I keep saying "suggested datum". Reason for this is the datum offered is simply that "suggested", it is not the law and cannot cover everyone's driving enviroment, style and so on. So within reason if the problem is geometric ( not mechanical ) then using the angles different forces outside of MB's suggestion is wise.
A few points i would like to add...
: The reason MB's tolerances are so small is the build quality is so superb. They don't allow large tolerances because in their opinion it will not be needed.
: Other manufactures do get it wrong? Over years i've had to write new solutions for the likes of BMW, Mazda, Lexus, Honda and so on.
: The MB's near perfect symmetrical build is it's nemesis not because it's bad but it's perfection cannot cope with the UK's road crown, so what to do? Flatten all the roads or inertly dial in a geometric compensation for the road crown.
