i had the same question on my 87 about 3 weeks ago or more. since the question i got 900 miles on them without any babying along. so i'd say the means get the job done but don't panic. i haven't looked but it wouldn't suprise me if there is 25% of the pad left when i take them down this week.
1972 350sl Red/Blk 117k
1988 420sel charcoal/Blk 140k
1987 420sel gold/tan 128k
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Pound it to fit then Paint it to match!
There is only First Place and Varying degrees of last!
Old age and deceit will overcome Youth and Enthusiasm every time!
Putting the square peg in the round hole is not hard... IF you do it fast enough!
Old enough to know better but stupid enough to do it anyway!