That is not the reason, I don't think. I think the floating calipers offer better performance or lower weight so are fitted to the sec. which has some parts in common with the SLs of the same era, such as the gorgeous aluminum a arms in the rear.

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.