W126 300SD

does any one know if these are "floating calipers?" one piston moves as the inner one moves along with the caliper. i have been told both so i would like to confirm this. thanks

ned

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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05