PBR pads will scream all the time if used only on the rear -- you need to put them on the front, too (or so I've been told) and you MUST use the antisqueal shims to eliminate the noise.
I prefer to use OEM pads. Yeah, you get more trake dust, that's a pain, but they stop wonderfully and never squeal.....
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!