I heard a scraping noise from the front right wheel area on my 90
Accord. I figured the brake pad had worn down to the squeeker so bought
a new set of pads.  When I got the wheel off I could see that the quiet
shims had crept out about 3/8 in so that they would drag on the disk.
That part was pretty chewed up.  I ordered all 3 shims, not local
stock.  I don't understand how this can happen.  The shims are secured
by ears which slip over the pad.  I replaced the pads myself about 40K
miles ago.  You would think that an assembly error would have shown up
a long time ago.  Any idea what went wrong??
Bob