The pads normally are a bit different in thickness. Sometimes it's the outside, sometimes the inside that's thinner, probably due to the greater exposure of that side to road dirt, etc.

However, if there is a full 1/8" difference, I would check for a sticking piston on that side, or one dragging on the worn side, there shouldn't be that much difference.

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!