Then that had to have been your brake pad wear indicator, not your "bulb out" indicator...

...the brake pad sensors cause the flickering as the pads wear until at some point it's solid when you depress fully at a stop. The bulb out indicator doesn't do this.

...but at least it's fixed.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car