Originally Posted by N8N
There's three brake light bulbs per side - two W16Ws in the fender, which are the normal brake lights, and one H21W in the trunk lid, which only comes on under hard braking or as a rear fog if you have enabled them. The actual tail/running lights don't use bulbs, they're LEDs.
That is very useful info, thanks ! I think this should be clarified in OP.
Is there any way w/o any ohm meters and such to test out these bulbs ? For the reg brake you can in your garage but for the hard brake ones you can't...