If the electrics check out negative [no juice to the rear bulbs] and the fuses, etc... are ok try this:
This happens on my 356 [with upgraded non-boosted ATE 23mm dual circuit MC] occasionally. Pull the brake switch off the MC [plug so fluid doesn't leak] clean out with carb / brake clean any fluid / gunk that has accumulated there. Re-install and press hard on pedal. B/c my car sits for extended periods [even with frequent fluid changes] it tends to gum / gunk up. May work for you.
A new switch is cheap.
Jase
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