So, dragging this thread out of the grave: I, too have had success with my 94 e320(non asr) rectifying inop cruise with brake light switches. I’m on the fourth one(I don’t believe the third one went bad)
My issue is that cruise works at lower speeds, say 45-55mph but won’t work any longer at 70-85mph. It engages for a split second and then kicks off right away. I remember reading something in the past about problems with early w210 cruise not working at high speeds, but I can’t seem to find the thread...
Anyone have any insight?

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate