Car's in the shop for new water pump, and my guy noticed that the front pads were installed backwards. A friend and I did these in March. I don't remember any instructions, warnings, or visible differences with the pads.

Is this possible? Or is he trying to stiff me to "correct" the issue for $108?

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL