Date registered: May 2003
Vehicle: 72 280 SEL 4.5 - 81 VW Rabbit - 85 XJS - 86 XJ6
Location: Savannah, GA
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I don't know if it is the same situation but I recently had my 72 W108 taken in to replace what I thought was a sticking caliper. Turns out it wasn't the caliper at all but a collapsed brake line that would cause the caliper to stick after a few miles, very much like a damaged caliper. Worth checking out I suppose, hope this helps.
1972 280SEL 4.5 W108.068/M117 V8