If we are speaking of a 57 you have asked other questions about, the 57 Clipper supplement to the 56 Stude shop manual and wiring diagram both indicates brake lights are protected by the aux fuse which I believe will be an underdash fuse at far left side -- location 8 in the photo.
Attach file:
fuse location.jpg (122.17 KB)
fuse block.jpg (270.04 KB)
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