I tool my 300SD for inspection and one of the things I was told is that the calipers are dragging. I'm a mechanical newbie, but figure things out pretty quick (just converted the car to WVO myself). What does dragging calipers mean and what do I do? I did a search, but none of them really addressed the dumbass like myself...

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1980 300D (Luna)
1980 300SD (Sunny)