Originally Posted by YetiGS
He says it's doable. I'm going to send him close up pictures of the connectors when I get home so he can cross-reference them against his supply of BMW connectors and then make up a switch to test. I'll keep y'all posted.
If I was going to try it, I'd look to do the same. Make a switch that just plugs between the stock connectors. No warranty issues, no wiring troubles.
If the computer isn't constantly checking for continuity or has no minimum absolute voltage trigger, you could run into a problem where the brain box assumes the front wheel is locked because it is not seeing a varying signal when you trip a brake switch. I would assume that would not be the case since we are no longer in 1988.
Another effective solution would be to place a switch in the power supply to the ABS pump (if equipped), maybe even the valving depending on how it's wired.
Shielded wiring typically has a metal mesh below the outer plastic skin to reduce electromagnetic interference.