wire/lamp identity??

If other 72 owners say it is a brake warning lamp, I cant argue. I don't have 72 wiring diagrams. That really doesn't sound correct to me though.
Brake warning lamps are in circuit boards where circuit boards are used ( not all have the boards ).
A separate lamp as you show there is more often a seat belt warning, reverse indicator, economy/efficiency, something not found in all or earlier builds.