never trust guys at the store, they like to think they are smart. well im glad that you got that resolved. Mercedes sells anti squeal past that you apply to the back the pads, and it works like a charm. well at least now you will read directions

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Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"