I replaced the entire SVS switch this morning without a great deal of difficulty using this guide: ABS Mod - LAND ROVER CLUB V.I.

Did great! Wired everything back up and went for a test drive in the yard, it wasn't long before I realize that I couldn't brake at all, and that the pedal (when attempting to brake) sank all the way to the floor. I'm guessing that I missed the requirement for brake bleeding with this procedure? That is my question, I took the ABS modulator out of my car, put it back in, and now, it won't work unless the brakes are bled?

Thanks, please be gentle with my noobiness, I'm learning.
-Matt

EDIT: Just found the place in the guide that says "if you disconnected any brake lines, the brakes MUST be bled."

 

Lol, you beat me to it. Check my post on how I bled the brakes in the shuttle valve seal replacement sticky.

 

Yeah, unfortunately you have to bleed the brakes on each of the 4 wheels. It should only take about an hour more. 4 Jack stands helps too. Good time to rotate your tires.