Had noticable wheel judder when high speed braking after a recent tyre change. I retorqued all the nuts and some were massivley overtightened and needed nearly my full 90KG on a long breaker bar to loosen them. Saw the fitter going round the nuts with a torque wrench but reckon they were just checking if any were loose after spinning them up with the air gun. No judder when I had retorqued them and after just having a front disk off to reatach the dust sheild I can see how overtightening will cause problems . The hub face is not flat and has an inner and outer mounting ring to mate with the inside of the disk so overtightening will cause the hub and /or disk to warp......
It's 140Nm for a reason and not crank them up by 'feel' with your longest breaker bar. 2012 TDV8 Vogue (L322)

You're dead right, seen this time and time again.... mechanics, usually tyre fitters, using windy guns on the nuts with the car on a jack and then checking they were up to torque when on the floor. In fact they are seriously overtightened...

And god help you if you have locking wheel nuts and they overtighten them....  Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
-Click here for Thread-
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click here for Project Fatty off roader-