Usually, if there are shims behind the pads, they are there to correct a squealing problem and should be re-used. If, however, you don't have problems, you don't need them.

PBR Metalmasters almost always require shims to keep them from screaming, I've heard. Not in the box, must be purchased separately, but can be re-used.

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!