i dont know the answer to any of this, but i offer the following observation about mercedes benz cars i have owned:

most have had solid front rotors. this has only been a problem on one, my 82 123 wagon, which would warp a brand new rotor in short time (or deposit brake material on it perhaps). i attributed this to the fact that it was heavier than my other 123s and had an automatic tranny. i assumed they were warping from heat.

all of my mb cars with vented rotors have not warped that i can remember.

my wifes pt cruiser has lumpy rotors at the present with 45k miles. it has vented rotors.

if the article posted is true, why cant i see the brake material that is deposited on the rotors? and why can they be turned and trued if they are not warped?

i have decided that i dont think you can warp them by torquing them wrong based on nothing except my thoughts. i could be convinced otherwise, but i am thinking that at present.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.