Dave, Bitchen photo, thanks. There were many experiments in the early days to keep tires from splashing pedestrians and this may have been one of them.
Yeah, that is a photo of a Japanese Ford Model AA bus that I had posted on the MAFCA Facebook page. The brushes by each wheel were an era requirement in Japan to prevent dirt and stones from splashing up on pedestrians.
Here is a 1930 Japanese Ford Model A where you can see those wheel brushes as well:
....and here is a 1929 Ford Model A bus in Japan where you can also see those wheel brushes:
...and in this photo you can see just the mounting brackets for those wheel brushes where the wheel brushes have been removed: