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Update on brake light switch'

I went out this morning and crawled under the truck and found the adjusting nut, turned it about 1/2" longer, and it made no difference in the position of the brake arm. It seemed that all it was doing was pushing the rod in farther. I removed the pedal from the brake arm, in case that was somehow binding and interfering with movement, and it made no difference.

What I finally ended up doing was to pull the brake switch and weld a steel plate onto the arm, adding about 1/2 " to it on the dege that contacts the brake arm. That solved the problem, now my brake lights go on when I step on the pedal, and off when I release.

I'm wondering if the fact that I have a dual master cylinder rather than an original makes any difference. Could it be that the adjustment is different? Don't know what's going on, but at least my lights are working right.

Tim