I don't know exactly how the brake light works with the cruise but I could imagine that since the cruise control is canceled when you step on the brake, then possibly if you overload the brake circuit or fry something back there, then it may affect the cruise by shorting something out. But if it only applies to bulbs above 21W that are not approved by the factory then possibly we could still rig a 21W bulb as a second pair of brake lights without hurting anything. I suppose we would have to ask one of the techs here or something.

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Rob C
89 190E 2.6
Beige