RE: BRAKE FAILURE Light

[Jim Grammer <jimg@domain.elided>]

>I got more time to work on the '72 Scout this weekend and went after the
>wiring.  I got the Hella H-4s transfered to the Scout from the Blazer
>then went after the lights on the dash.  What is the BRAKE FAILURE light
>for?  Is it a sick joke?  Does this light come on just before you smash
>into something because your brakes don't work anymore?  Or does it come
>on when the brakes are warn badly or out of adjustment?

The light is triggered by the plunger switch in the switch block/brake 
distribution manifold next to the master cylinder. When a line pressure 
imbalance occurs(such as losing fluid from front or rear brakes but not 
both)the plunger is forced off to one side, actuating the switch. The light 
comes on to tell you that you now have 1 brake circuit bye-bye for some 
reason.

Jim