Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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Could be pads need replacing. Could be the leak in the brake line is reducing line pressure below safe levels. Could be a bad switch at the e-brake. Could be a fault somewhere in the brake sensor system.
I'd bet on brake pads, but a car that old could have a fault in the brake sensor system due to age. Connections corrode, insulation gets brittle and breaks, wires break from flex.
Good luck finding the gremlin.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck