The problem trying to rebuild those calipers is trying to find the casing half gaskets, the rest are easy to find.

You probably have a stuck caliper, but it wouldn't hurt to check out the rear hoses. They could potentially collapse inside causing pressure to not want to release back the way it came. Take off the hose and try to blow through it. If you can barely blow through it, replace it.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition