I am getting frustrated with this warning.
My defect. lamp warning comes one once in a while (once every two-three days) when I apply the brakes only.
a few days ago, I replaced all brake bulbs and it just did it again.
It's a 1997 W210 (E420), what else do I need to look for? The plastic cups that hold the bulbs seemed fine when I checked them. . .

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)