yes Mark, the 'standard' way of wiring an 1157 is one bulb in the light housing, I understand that, Carl is suggesting using both elements of one [1157] bulb for brake, and the single element of a
second bulb for tail lights, I simply suggested using a brighter single filament bulb for the brake, skips 'modifying the socket' - with 12V, using the 1157 for both functions would certainly 'work', Carl wants to design a better mouse trap

I am in the process of modifying the stop light socket to accept an 1157 bulb (dual element). I then plan on wiring the two wires together so both elements light up when you step on the brakes. I will keep the running light bulb as is. (...)
Bill