I hate to give you advice without seening your exact setup. I wish I had a schematic, then I could mark it up and send it back. I have a cc disconnect built in to the stock setup in the ecm, acutally with the stock setup the brake will not come on without the go pedal at 0 or cc off. with the switch on the shifter I can turn on the brake at WOT (not recommended). I simply put a wire from the vacuum acutated electric switch to the output of my stock switch I picked the wire that goes to the vacuum solenoid that actually turns the brake on.
I will pm you a schematic of the jake set up on my 2001, if you have any questions pls ask.
I will pm you a schematic of the jake set up on my 2001, if you have any questions pls ask.