Brake hoses are definitely shot, replace them all. I've seen this several times -- the hose lining goes bad and a flap forms that acts as a one-way valve. YOu apply the brakes and they stay on, forever or until you open the bleeder, when they nicely release.

New hose will fix it.

Flush all the fluid out of the rears, too, and I'd plan on a caliper rebuild back there, too, they will stick eventually from old hard piston seals.

You should know that MB rotors are disposable -- usually need to be replaced every third set of pads or so, cannot be turned. They are not expensive. Easy to check -- if there is a distinct lip on the edge of the rotor where the pads don't cover, replace the rotor, it's undersized.

If you let the rotors get too thin, the backing plate on the pad will contact the anti-rattle spring, the pistons will get cocked, stick, overheat the pads, and roast all the rubber parts in the calipers. Avoid the hassle by replacing the rotors as necessry.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!