all to common on many GM boards, I struggled with that for a long time in my Firebird. I replaced nearly every part till the last thing I did was toss some cheap $15 pads on it.
and I had brakes, as if the fancy high dollar pads I had on there, that still looked new would not grip at all till you got real hard on the pedal. [ who changes pads that look new, used a grinder to give them a fresh surface, no help ]
a good 5 years of crappy brakes and spending money yearly to try something different.
my long strugle
http://www.thirdgen.org/techboard/br...i-do-keep.html