Keith,

First off, DONT'T EVER TURN MERCEDES ROTORS! You should replace them both front and back anytime they are at the minimum thickness which I think on a 126 is 25.4?? Order new rotors front and rear and I'll walk you through replacement.

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Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'79 6.9
'80 300SD
'85 380SE
'89 420SEL
'93 300E 2.8