How did you break in the pads?

New pads won't work very well until you wear the "fur" off the operating surfaces (100 miles or so in city driving). This can result in much better braking on one wheel than on the others for a short time, and that will trigger the ABS.

Make only gentle stops until you get solid pedal (it will be a bit soft to start with) to prevent groaning brakes later on.

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!