I was looking around my booster and master cylinder on my 69 z/28 the other day and noticed a wire that is not attached to anything and I do not know what it goes to. It comes out from the wiring harness that runs along the top of the firewall, it comes out real close to the trim tag and is lying over behind the booster. It has an insulated sleeve over it that looks the same as the one over my temperature guage wire that attaches to engine temp sensor. I have looked in wiring manual and can't find anything that it could be other than the wire to measure my brake fluid maybe. If anyone has any ideas, please let me know. Thanks alot.