Thanks for the response,

When the light would not work at all, I did the brake switch replacement and "bending of the prongs" to make contact, it would not come on when you used the parking brake.
Then one day, it started working like 5-9+ years later.... but about the same time the light started flickering, it stops well, and the flickering light went off last week when I put the master cylinder on, but now it is back on, don't see loss of fluid, but I guess I'll pull the wheels back off, and look closer as I cleaned everything when I had the rear drums off and the calipers when I greased the bearings.

So what does the "hold off" valve do? it's purpose

Bill