I have the identical problem on a 2002 National Dolphin (W22 Chasis) and after a dealer "helped me with it", they made it worse. Now the brake lights are on unless I lift the pedal so slightly with my toe, then brake lights and CC are good.
Here is a photo of what it looks like. It's pretty self explanatory once you see it, but laying on your back trying to reach it is, to say the least, less thann optimal.