Well for quite a while my 190e 2.6 would vibrate quite a bit when even the slightest bit of brake pressure was applied. So I took off the right wheel and turned the rotor, I could clearly see the rotor wobble instead of spinning straight. Got a pair of 2 new rotors, adjusted the wheel bearing play and problems' gone!

Thought I'd share.

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190e 2.6 1990. 300,000 KM
C230 K 2000, 130,000 KM