So I finally replaced my leaky master cylinder and rotted out booster earlier with a set I yanked from another disco of the same year. Went back together fine but the pedal doesn't return enough now to turn off the brake lights. I'm probably just a moron and have missed something but I can't figure out what I did wrong. Brakes work fine, pedal just doesn't engage the switch, it's like the rod is shorter or something. What did I do wrong?

 

The rod is fine, the switch is auto adjusting. When you disconnected the old booster the pedal returned father because it was not retained anymore. This compresses the brake switch more than before. All you have to do is get under there, push down the pedal, grab the push button on the switch and pull it all the way out. You'll feel it ratchet out, then just release the pedal and it will push it back in to the proper adjusted distance.

 

Thanks for the info!