Symbol 0239 from ISO 7000 - Title/Meaning: Brake failure; brake system malfunction Function/description: To indicate that the primary braking function has malfunctioned.
Application referenced in: ISO 20381, ISO 2575, ISO 6405-1
Additional information: 
On road vehicles: 

telltale shall be red
in the case where a single tell-tale indicates more than one brake system condition, this symbol shall be used.
Own work using: iso.org/obp/graphics/grs/956aa377-3749-4628-a6be-58317ac4dcc7 200.png
Vectorization:  Mrmw