Brian:

Check upper ball joints and sway bar bushings, too -- if one is bad or the bushings out, the control arm can tilt on braking, changes the caster/camber on one side.

A brake hose with a loose lining can work like a one-way valve. I've had quite a few calipers hold pressure, refusing to release until the bleeder is opened. I see no reason why it wouldn't work in reverse -- allow fluid to move back up but not down when a peice of the lining is torn.

Check brake lines by flexing -- if you see crackes in the rubber on a rather sharp bend, replace them all. A bad liner will show up as bulges in the outer covering. Those will eventually leak.

However, if you have even pad wear (except for the normal condition of outer pads being slightly thinner), it's loose suspension parts.

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!