Got the brake switch problem figured out, and now I have a spare switch. Turns out all I needed to do was the "toe board adjustment", which amounts to simply adjusting the master cylinder pushrod, until their is 13/16 inch clearance between the firewall, and the end of the brake arm. On the plus side I have great pedal travel clearance too. Brake pedal is a long way from the floor under hard braking.
http://oi68.tinypic.com/1zywz83.jpg

Last edited by 4100 Fire Truck; 06/08/2018 11:16 PM.