French to English Other Automotive / Cars & Trucks technical specification

Embuage was hard to find – even with a Google search – but I did come up with “steaming”, which seems to me to mean the same thing as fogging, in the context of a car…or does it actually something different? It is used as the title of one subsection (Fogging-Embuage), and also there is not much in that subsection, but it does talk about a “indice d’embuage” and the value it should have. I just want to confirm that these two terms are actually synonymous, or if they are not, then what is “embuage”? Thanks.